Please note: Any content published on this site is commentary or opinion, and is protected under Free Speech. It is only provided for educational and entertainment purposes, and is in no way intended as a substitute for Eggs are produced in clutches of four to fourteen, with an average yield of 7.6. Predation by non-native species such as red foxes, rats, and domestic cats also poses a major threat to … The photo above right was taken of a California Clapper Rail at the San Francisco Bay perimeter near the Dumbarton Bridge; the Don Edwards San Francisco Bay National Wildlife Refuge in the area provides protected habitats for this and other native species. A close relative of the California Clapper Rail is the Light-footed Clapper Rail, Rallus longirostris levipes, a US Federal and California state listed endangered subspecies that ranges from Santa Barbara County to the extreme north of the Mexican coast of the Pacific Ocean. The historic range of the California clapper rail extended within the coastal California tidal marshes from … Eggs are produced in clutches of four to fourteen, with an average yield of 7.6. Yellow rail. California clapper rail in recent years and found to have relatively high nesting densities (J. Albertson, USFWS, pers. A couple of weeks after I shot this, I found out these guys are endangered. Control of feral animals (wild or untamed animals, such as wild domestic cats) is a major concern for clapper rail conservation becaus e feral animals often kill clapper rails. Marsh channelization is the most commonly recognized factor associated with many aspects of California clapper rail habitat use. It is a subspecies of the common clapper rail, Rallus longirostris, and to keep it sorted the famed 19th-century Smithsonian ornithologist Robert Ridgway appended the subspecies name obsoletus: the long-nosed, obsolete rail. Pages: 147-153. A member of the rail family, Rallidae, it is a chicken-sized bird that rarely flies. Avianweb / BeautyOfBirds or any of their authors / publishers assume no responsibility for the use or misuse of any of the published material. The California Clapper Rail ( Rallus longirostris obsoletus ) is one of the most endangered species in California. It is found principally in California's San Francisco Bay to southern Baja California. Range, Populations and Activity. When evading discovery, clapper rails typically freeze, hide in small sloughs or under overhangs. The California Clapper Rail (Rallus longirostris obsoletus) is an endangered subspecies of the Clapper Rail (R. longirostris). The twig nest is placed low sometimes among plant roots, and three purple-spotted buff eggs are laid. California Clapper Rail. The California clapper rail is a largish, brownish endangered marsh bird with carrot-stick legs and a long, glowing-orange bill. Ridgway's rail. The California Clapper Rail (Rallus longirostris obsoletus) is an endangered subspecies of the Clapper Rail (R. longirostris). The U.S. FWS's Threatened & Endangered Species System track information about listed species in the United States The large Clapper Rail is abundant in saltwater marshes and mangrove swamps from the U.S. East Coast to Central America and the Caribbean. All of their subpopulations have been through recent genetic bottlenecks. Crows: The birds that go fishing with breadcrumbs! the California clapper rail is the size of a coot and is slightly larger and grayer than the two southern subspecies (CDFG 2000). It is found principally in California's San Francisco Bay to southern Baja California. The California clapper rail was first described as a king rail, R. elegans var. A complete survey of its population and distribution within the San Francisco Bay Estuary was begun in 2005. Its breast is cinnamon-buff colored. Harvey, H.S. call. Its name is derived from the call it makes which sounds like clapping. Note gray cheek patches. American coot. The California Clapper Rail is one of the largest rails. It is found principally in California's San Francisco Bay, and also in Monterey Bay and Morro Bay. Ridgway's rail has been observed to forage in or near relatively disturbed areas, leading one to deduce the importance of protecting even numeral marsh areas; for example this species was seen foraging in a small mudflat area within Seal Slough in San Mateo, three miles from the nearest known breeding area in Belmont.[7]. The California clapper rail is a bird scientifically known as Rallus longirostris obsoletus. obsoletus) Citation: Trace element and organochlorine concentrations in California clapper rail (Rallus longirostris obsoletus) eggs. Sora. Clapper rails are secretive and difficult to observe in dense vegetation but they can be often be seen when they are crossing a tidal channel. Although not migratory in coastal wetlands, this species disperses juveniles into freshwater wetlands in late August through October. The incubation period is 18 to 29 days, and the hatching success is 38%, notably less than the similar light-footed rail indigenous to southern California. During this breeding season the bird density was approximately 0.1 to 0.6 individuals per acre; outside of breeding season densities decline to 0.04 to 0.40 individuals per acre. At such high tides it may also prey upon mice, and has been known to scavenge dead fish.[4]. For cover the California Clapper Rail seeks out emergent wetland dominated by pickleweed and cordgrass, or brackish emergent wetland with those two plants plus bullrush. Bolsa Chica. California clapper rail definition is - a large short-tailed clapper rail (Rallus obsoletus) of the Pacific coast of North America from Puget Sound to Lower California. Rush, Karen F. Gaines, William R. Eddleman, and Courtney J. Conway Version: 1.0 — Published March 4, 2020 Text last updated March 21, 2018 It has year-long, circadian activity and is most vocal nocturnally and crepuscularly. (13-19 inches) It looks like chicken with a long, slightly downward-curving bill. The clapper rail is part of the order Gruiformes and the family Rallidae. According to what I read, these rails are an endangered species, but in the Corte Madera, CA marsh, where I do a lot of my wandering, there's a family of them, and they don't seem to mind my poking a camera in their faces from fairly close up. Sora. At such high tides it may also prey upon mice, and has been known to scavenge dead fish. Black rail. This secretive bird lives most of its life concealed in dense vegetation. Please contact them directly with respect to any copyright or licensing questions. (adsbygoogle = window.adsbygoogle || []).push({}); © 2011 beautyofbirds.com - All Rights Reserved. Furthermore, this methodology is consistent with current USFWS survey protocol for CCR, whereas the 1990 method is not. During this breeding season the bird density was approximately 0.1 to 0.6 individuals per acre; outside of breeding season densities decline to 0.04 to 0.40 individuals per acre. Clapper rail. Clapper Rail Rallus longirostris, a bird of mainly coastal marshes, was split into three species, and King Rail Rallus elegans of the eastern U.S. was split into two. Ridgway's rail (Rallus obsoletus) is a near-threatened species of bird. The Clapper Rail is usually hidden in dense cover, but sometimes we see it stalking boldly along the muddy edge of the marsh, twitching its short tail as it walks, or swimming across a tidal creek. Two types of surveys were conducted: call Orange Co., CA. The Heroes that Were Pigeons: The Smart “Rescue and War” Pigeons Albatrosses (4) American sparrows, towhees and juncos (40) Auks, murres and puffins (9) Bird of prey (25) (13-19 inches) It looks like chicken with a … Thank you. Three subspecies of Ridgway’s rail are resident in California, all of which depend on mudflats or very shallow water (wetland habitat) where there is both forage and taller plant material to provide cover at high tide. In 1926, A. J. Clapper rails are secretive and difficult to observe in dense vegetation but they can be often be seen when they are crossing a tidal channel. Black rail. Purple gallinule. They are hard to see in dense vegetation. San Pablo Bay NWR, California: Virginia Rail, Sora, Clapper Rail, Black Rail 10. DFG TaxonID: 1163: Other Identifying Codes: CNDDB (ABNME05016) , TNS-Global (100535) , CWHR (B144B) The California Clapper Rail is a bird that likes to be heard, but not seen. The California clapper rail (Rallus longirostris obsoletus) is a federal and state listed endangered species. The U.S. FWS's Threatened & Endangered Species System track information about listed species in the United States (Redirected from California Clapper Rail) Ridgway's rail (Rallus obsoletus) is a near-threatened species of bird. Ridgway's rail (Rallus obsoletus) is a near-threatened species of bird. Furthermore, some taxonomists consider that the King rail and Aztec rail should be considered within this group, as those birds look similar and the birds are known to interbreed where they share territories. Author(s): Lonzarich, David G., Thomas E. Harvey and Jean E. Takekawa. As of July 2014, the formerly called California Clapper Rail is now called the Ridgway's Rail. It is 32-47 cm from the tip of its bill to the tip of its tail. A member of the rail family, Rallidae, it … California Ridgway's Rail was listed as California Clapper Rail, Rallus longirostris obsoletus. California clapper rail surveys were conducted between January 15 and April 15, 2006, using stan- dardized survey protocols approved by the USFWS. The clapper rail is … California Clapper Rail And Salt Marsh Harvest Mouse Survey Work Plan H. T. Harvey & Associate 7 February 2006 5 comparability with California Clapper Rail density data found in other marshes in the San Francisco Bay by PRBO. David C. Zeiner, William F. Laudenslayer and Kenneth E. Meyer. WarblerLady. According to a study conducted…, Throughout history, Crows, Ravens and other black birds were feared as symbols of evil or death.…, These splendidly plumaged birds are found in certain areas of Southern Mexico and Central America…, It has already been recorded that the Common Poorwills can enter extended periods of hibernation as…, Smallest Bird in Existence: Which is it: the Bee or the Bumble Bee Hummingbirds? Like other subspecies of Clapper Rail, this form has a long, downward curving bill and is grayish brown with a pale chestnut breast and conspicuous whitish rump patch. It has a henlike appearance with strong legs, long toes, and a long bill. Inyo California Towhee. Pipilo crissalis eremophilus. Depending on the…. The California Clapper Rail breeds in the San Francisco Bay from mid-March through July, with peak activity in late June. But today, on this windy morning at Arrowhead Marsh in Oakland, they aren’t too vocal. The California clapper rail measures 13–19 inches from bill to tail. Please Note: The articles or images on this page are the sole property of the authors or photographers. Goosehead, C.M.Hogan, K.Wilson, G.W.Ball, V. Strifle et al., Don Edwards San Francisco Bay National Wildlife Refuge, L. Liu et al., "California Clapper Rail (Rallus longirostris obsoletus) Population monitoring: 2005–2011" PRBO Technical Report to the California Department of Fish and Game. See another shot of this bird in the comment box below. Thus, the U.S. Habitat loss due to development and degradation is the primary factor resulting in population decline. Tag Archives: California Clapper Rail Endangered Species Spotlight. It has year-long, circadian activity and is most vocal nocturnally and crepuscularly (during the twilight). Rails. Nest placement, probability of site For cover, Ridgway's rail seeks out emergent wetland dominated by pickleweed and cordgrass, or brackish emergent wetland with those two plants plus bulrush. Clapper Rail Split. This guy seemed to have no fear of me, letting me get in fairly close for a few shots. California’s three subspecies of Rallus longirostris become subspecies of Rallus obsoletus, which is given the English name Ridgway’s Rail. A clattering cackle in the salt marsh is often our first clue to the presence of this big rail. This subspecies was added to the U.S. A member of the rail family, Rallidae, it is a chicken-sized bird that rarely flies. Purple gallinule. This secretive bird lives most of its life concealed in dense vegetation. Large, slender chickenlike rail with a long, slightly curved bill. The California clapper rail, a state and federal endangered species, feeds at sunset in the Arrowhead Marsh in the Martin Luther King, Jr. Previously known as the clapper rail, the species name was changed in 2014 to honor ornithologist Robert Ridgway. The light-footed clapper rail is one of the most endangered birds in California. USGS California Clapper Rail Study. Despite this wide range, numbers of the Clapper Rail are now very low on the United States' west coast, because of destruction of the coastal marshland habitat. King rail. Ingrid Taylar. This subspecies was added to the U.S. A member of the rail family, Rallidae, it is a chicken-sized bird that rarely flies. Additional and significant pressures came from human development and encroachment, drained wetlands, and increased terrestrial predation. The Trinidadian subspecies, R. l. pelodromus, is more heavily marked with black above than any of the other Clapper Rail forms. Rallus longirostris obsoletus The California Clapper Rail is a chicken sized bird that rarely flies. comm., Baye 2004). Year: 1992. california clapper rail - development of a geographic information system-based habitat suitability model to guide restoration efforts in the north bay region this project will develop a habitat suitability model based on habitat and landscape relationships of the california clapper rail (rallus The light-footed clapper rail is one of the most endangered birds in California. The California Ridgeway’s Rail (formerly Clapper Rail) or Rallus longirostris obsoletus is one of the most endangered birds in California. T.E. American coot. Klamath Marsh NWR, Oregon: Virginia Rail, Sora, Yellow Rail Changing water levels in marshes dictate a great deal of the day-to-day movements of rails, and the changes can be used to your advantage. Other frequent sightings of this species around the San Francisco Bay include the Napa Sonoma Marsh, Bothin Marsh in Mill Valley, Gallinas Creek in San Rafael, Arrowhead Marsh in San Leandro, California, the Palo Alto, California baylands, Charleston Slough in Mountain View, California, Seal Slough in San Mateo and Belmont Slough. In 2014, the species was split into three: Clapper Rail; Ridgway's Rail of California, Arizona, and Nevada; and Mangrove Rail of South America. Other rails, gallinules and coots. California Clapper Rail (Rallus longirostris ssp. Your use of this website indicates your agreement to these During the invasive Spartina eradication period, between 2005 and 2011, populations of the federally endangered California clapper rail (Rallus longirostris obsoletus) in San Francisco Bay declined by nearly 50% (), presumably because of the overall decline in cover of Spartina in which clapper rail nests and forages. The bird was hunted to near extinction, a sad but common fate for other Bay Area and U.S. species. April 2013] The Clapper Rail is commonly found on the East Coast; however, the Californian subspecies is classified as "Endangered" and populations are under threat due to habitat loss. It is found principally in California's San Francisco Bay, and also in Monterey Bay and Morro Bay. The bird will only forage on mudflats or very shallow water where there is taller plant material nearby to provide protection at high tide. Resplendent Quetzals - The Rare Jewel Birds of the World. Image: Book researcher, freelance writer, and photographer Ingrid Taylar was on hand in January 2009, when a US Geological Survey team from the Western Ecological Research Center arrived to band and radio-tag the remaining thousand or so California Clapper Rails in the Bay Area. Santa Venetia Marsh Open Space Preserve is a fragile salt water marsh ecosystem in North San Rafael. Endangered Species List in 1970. California Clapper Rail, Elegant Tern and Eared Grebe [Huntington Beach. Other frequent sightings of this species around the San Francisco Bay include the Napa Sonoma Marsh, Bothin Marsh in Mill Valley, Gallinas Creek in San Rafael, Arrowhead Marsh and Damon Marsh in Oakland, the Palo Alto baylands,[6] Charleston Slough in Mountain View, Seal Slough in San Mateo and Belmont Slough. California Clapper Rail. Travel & tourism photos for Sonoma Valley, California - California Clapper Rail It is found principally in California's San Francisco Bay, and also in Monterey Bay and Morro Bay. The California Clapper Rail has been observed to forage in or near relatively disturbed areas, leading one to deduce the importance of protecting even ruderal marsh areas; for example this species was seen foraging in a small mudflat area within Seal Slough in San Mateo, three miles from the nearest known breeding area in Belmont. January 24, 2013 . It uses material from Wikipedia.org. It is 32-47 cm from the tip of its bill to the tip of its tail. Although not migratory in coastal wetlands, this species disperses juveniles into freshwater wetlands in late August through October. The California Clapper Rail forages at the upper end of marshes, along the ecotone between mudflat and higher vegetated zones, and in tidal sloughs. The large Clapper Rail is abundant in saltwater marshes and mangrove swamps from the U.S. East Coast to Central America and the Caribbean. Search for: HOME; Bio; Field Ethics; Blog; Galleries. Rallus longirostris obsoletusRallus crepitans obsoletus. The clapper rail (Rallus crepitans) is a member of the rail family, Rallidae. Virginia rail. The population levels of Ridgway's rail are precariously low due to destruction of its coastal and estuarine marshland habitat by prior land development and shoreline fill. It is found principally in California's San Francisco Bay to southern Baja California. California Clapper Rail (A) Description and Ecology The California Clapper Rail, Rallus longirostris obsoletus, is a northern California bird that typically resides in the San Francisco Bay Estuary, and can be seen as south as San Luis Obispo and Morro Bay. It has a cinnamon-colored breast, dark flanks with white bars, and olive-brown upper parts. Endangered Species List in 1970. William R. Eddleman and Courtney J. Conway Version: 1.0 — Published March 4, 2020 Text last updated March 21, 2018 terms. (2012), US-FWS: Species Profile for California Clapper rail (, Seaworld.org: Light-Footed Clapper Rail (, US-FWS: Species Profile for Yuma Clapper rail (, San Francisco Maritime National Historical Park, San Francisco Estuary and Watershed Science, Transportation in the San Francisco Bay Area, https://en.wikipedia.org/w/index.php?title=Ridgway%27s_rail&oldid=991359697, Native birds of the West Coast of the United States, Natural history of San Mateo County, California, Taxonbars without secondary Wikidata taxon IDs, Taxonbars with automatically added original combinations, Creative Commons Attribution-ShareAlike License, This page was last edited on 29 November 2020, at 17:22. It is not clear whether it requires any source of fresh water. The light-footed clapper rail is one of the most endangered birds in California. Breeds in coastal marshes and wetlands with emergent vegetation. obsoletus, in 1834, and in 1880 the species was reclassified as a new species of clapper rail, R. obsoletus. It is now Rallus obsoletus obsoletus The California Ridgway's Rail is one of the largest rails. The California Clapper Rail (Rallus longirostris obsoletus) is an endangered subspecies of the Clapper Rail (R. longirostris).It is found principally in California's San Francisco Bay, and also in Monterey Bay and Morro Bay. Nest placement, probability of site It is not clear whether it requires any source of fresh water. Ridgway's rail Conservation status. Scott A. Terms Of Use / Copyright Restrictions, Site Privacy Policy | Report Abuse | Website Administrator | Web Design by Drupal Development Services. Nikon D90. The upper body parts are … California Clapper Rail Study by the USGS. More than 500,000 images and video clips online, from tigers to turtles and elephants to sharks. California clapper rail definition is - a large short-tailed clapper rail (Rallus obsoletus) of the Pacific coast of North America from Puget Sound to Lower California. Clapper rails are secretive. The California Clapper Rail, Salt Marsh Native - Alameda, CA - The MLK Jr. Albatrosses (4) American sparrows, towhees and juncos (40) Auks, murres and puffins (9) Mussels, clams, arthropods, snails, worms and small fish are its preferred foods, which it retrieves by probing and scavenging the surface while walking. Download premium images you can't get anywhere else. professional advice. (See photo above) Once flushed, they can frequently be approached. Birds; Mammals; Reptiles + Amphibians; Bugs; Other Animals Please contact them directly with respect to any copyright or licensing questions. California Clapper Rails are an endangered endemic species only found in the San Francisco Bay Area. Yellow rail. Other races of Clapper Rail are found along the east coast of North America, where populations are stable although numbers have declined due to habitat loss, the coasts and some islands of the Caribbean, and across northern South America to eastern Brazil. The Ridgway's rail (formerly the California clapper rail) and the mangrove rail have been recently split. 0:00 / Clapper rail (call) call. California clapper rail in recent years and found to have relatively high nesting densities (J. Albertson, USFWS, pers. The California clapper rail is a largish, brownish endangered marsh bird with carrot-stick legs and a long, glowing-orange bill. The bird will only forage on mudflats or very shallow water where there is taller plant material nearby to provide protection at high tide. Larger and more compact (i.e., low perimeter-area ratios) marshes supported higher Marsh channelization is the most commonly recognized factor associated with many aspects of California clapper rail habitat use. The California Clapper Rail is a chicken sized bird that rarely flies. comm., Baye 2004). One of the largest population of Ridgway's rails is in San Francisco Bay, where a total of about 1100 are resident. [3], Ridgway's rail forages at the upper end of, along the ecotone between mudflat and higher vegetated zones, and in tidal sloughs. The largest population of California Clapper Rails is in San Francisco Bay, where a total of about 3000 are resident. This article is licensed under the GNU Free Documentation License. The lawsuit claims that Prop 4's enforcement might endanger the California clapper rail, the light-footed clapper rail, California least tern, western snowy plover, Belding's savannah sparrow, salt marsh harvest mouse and the San Joaquin kit fox. WarblerLady. California clapper rails are as tall as chicken. A California Clapper Rail in Palo Alto, California. The large Clapper Rail is abundant in saltwater marshes and mangrove swamps from the U.S. East Coast to Central America and the Caribbean. This chocolate-colored songbird is confined to … California Clapper Rail and information regarding current habitats and constraints such as human development, is seeking to establish what wet land habitats in the SF bay habitat is suitable as habitat for the Clapper Rail. Through 1915, according to Save the Bay, the California Clapper Rail was a menu delicacy. Ridgway's rail. In order to find them, Vivian Bui scans the air with a big metal antenna, attached to a receiver, while she listens through big headphones. Second, understanding the potentially devastating impact of rising sea levels on Regional Shoreline is one of the few places where you can see — or hear — this endangered species. [5] The photo above right was taken of a Ridgway's rail at the San Francisco Bay perimeter near the Dumbarton Bridge; the Don Edwards San Francisco Bay National Wildlife Refuge in the area provides protected habitats for this and other native species. The Smallest Bird on Earth Weighs Less than a Penny! That males are slightly larger than females is the only difference between them. The California clapper rail is one of three subspecies of clapper rail … Other rails, gallinules and coots. A member of the rail family, Rallidae, it is a chicken-sized bird that rarely flies. The incubation period is 18 to 29 days, and the hatching success is 38 percent, notably less than the similar Light-footed Clapper Rail indigenous to southern California. The largest population of the western subspecies, California Clapper Rail, R. l. obsoletus, numbering something under 3000 birds, is in San Francisco Bay; there is a small inland population along the Colorado River. In partnership with US Fish and Wildlife Service, US Navy Seabees, and the Audubon Society, Girl Scouts of California’s Central Coast have been engaged in a unique, long-term STEAM project - building, launching and monitoring floating nests for one of our local endangered species: the California Clapper Rail. Ridgway's rail breeds (California rail subspecies) in the San Francisco Bay from mid-March through August, with peak activity in late June. They may run rapidly through ve… California Clapper Rail (A) Description and Ecology The California Clapper Rail, Rallus longirostris obsoletus, is a northern California bird that typically resides in the San Francisco Bay Estuary, and can be seen as south as San Luis Obispo and Morro Bay. Common gallinule. A California Clapper Rail stands beside invasive [I]Spartina[/I], a salt marsh cordgrass, in San Francisco Bay. San Pablo Bay NWR, California: Virginia Rail, Sora, Clapper Rail, Black Rail 10. [2] It has a long, downward curving bill and is grayish brown with a pale chestnut breast and conspicuous whitish rump patch. Find high-quality California Clapper Rail stock photos and editorial news pictures from Getty Images. The California clapper rail (Rallus longirostris obsoletus) was listed as a California State Endangered Species on June 27, 1971 (CCR Title 14, Section 670.5) and Federally on October 13, 1970 Endangered (Federal Register 35 - 1604). - Nature Picture Library california clapper rail Subspecies yumanensis (ST) was called “Yuma Clapper Rail.” Modifying it to “Yuma Ridgway’s Rail” seems awkward, but could work. The taxonomy for this species is confusing and still being determined. The California clapper rail is a secretive hen-like salt marsh bird. Virginia rail. King rail. California Clapper Rail Population Monitoring 2005-2011 Final Report 5 Salinity and Invasive Spartina cover (up to 14%) had significant positive effects on density. Common feral predators of clapper rail adults, young, and/or The California clapper rail is one of the largest species of the genus Rallus, measuring 13-19 in (32-47 cm) from bill to tail. Rush, Karen F. Gaines, William R. Eddleman, and Courtney J. Conway Version: 1.0 — Published March 4, 2020 Text last updated March 21, 2018 In 2014, the species was split into three: Clapper Rail; Ridgway's Rail of California, Arizona, and Nevada; and Mangrove Rail of South America. This secretive bird lives most of … Conservation - Clapper Rail Nests. Regional Shoreline Park in … The species is dependent on tidal wetlands, which have decreased over 75% from the historical extent in San Francisco Bay. This species is closely related to the clapper rail, and until recently was considered a subspecies. [8] The twig nest is placed low, sometimes among plant roots, and purple-spotted buff eggs are laid. An endangered subspecies of the clapper rail, which is still common in the East, the California clapper rail suffered from unsustainable hunting during the Gold Rush days and, more recently, severe habitat decline in its coastal habitat. The light-footed clapper rail is one of the most endangered birds in California. It is found principally in California's San Francisco Bay, and also in Monterey Bay and Morro Bay. Mussels, clams, arthropods, snails, worms and small fish are its preferred foods, which it retrieves by probing and scavenging the surface while walking. Its upper parts are olive-brown. Scott A. Nature Picture Library offers the best nature photographs and footage from the world's finest photographers, to license for commercial and creative use. Something similar could be done with levipes (SE), formerly called “Light-footed Clapper Rail.” But how about our local obsoletus, formerly called “California The parrots that build "bird condominiums" : The, The record holder for speaking most words: the common. Clapper rail (call) call. All of their subpopulations have been through recent genetic bottlenecks. Despite this wide range, numbers of the Clapper Rail are now very low on the United States' west coast, because of destruction of the coastal marshland habitat. Common gallinule. The largest population of the western subspecies, California Clapper Rail, R. l. obsoletus, numbering something under 3000 birds, is in San Francisco Bay; there is a small inland population along the Colorado River. Plumage color varies from cinnamon to grayish depending on location. Posted on February 13, 2012 by SuburbanLGBT. A member of the rail family, Rallidae, it is a chicken-sized bird that rarely flies. The population levels of the California Clapper Rail are precariously low due to destruction of its coastal and estuarine marshland habitat by prior land development and shoreline fill. Copyright: Wikipedia. Klamath Marsh NWR, Oregon: Virginia Rail, Sora, Yellow Rail Changing water levels in marshes dictate a great deal of the day-to-day movements of rails, and the changes can be used to your advantage. They are found in the salt marshes of Morro Bay and San Francisco bay.