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Ridgway's rail then breeds (California rail subspecies) in the San Francisco Bay from mid-March through August, with peak activity in late June. [6] 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. [10]
Sensitive Species: Light-footed Ridgway’s rail, Belding’s savannah sparrow, California least tern, Western snowy plover, California gnatcatcher, and Least Bell’s vireo Migratory Birds: American wigeon, Northern pintail, Hooded oriole, Yellow-rumped warbler, White-crowned sparrow, and Cliff swallow [ 7 ]
Shorebird Aviary – light-footed Ridgway's rail, black-crowned night heron, black oystercatcher, red-breasted merganser, hooded merganser, and more; Raptor Row – red-tailed hawk, red-shouldered hawk, Cooper’s hawk, peregrine falcon, turkey vulture, barn owl, great horned owl, burrowing owl, American kestrel; Eagle Mesa – golden eagle ...
Ridgway's rail (Rallus obsoletus). Rallus is a genus of wetland birds of the rail family.Sometimes, the genera Lewinia and Gallirallus are included in it. Six of the species are found in the Americas, and the three species found in Eurasia, Africa and Madagascar are very closely related to each other, suggesting they are descended from a single invasion of a New World ancestor.
Slaty-breasted wood rail: Aramides saracura (Spix, 1825) 17 Ridgway's rail: Rallus obsoletus Ridgway, 1874: 18 Clapper rail: Rallus crepitans Gmelin, JF, 1789: 19 Aztec rail: Rallus tenuirostris Ridgway, 1874: 20 Mangrove rail: Rallus longirostris Boddaert, 1783: 21 King rail: Rallus elegans Audubon, 1834: 22 Plain-flanked rail: Rallus wetmorei ...
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Bird species of concern on the refuge include: [1] Yuma Ridgway's rail (Rallus obsoletus): Listed by the IUCN as Near Threatened. Burrowing owl (Athene cunicularia): Species of concern in California. Owing to their large range and population size, they are listed by IUCN as Least Concern, though the population trend appears to be decreasing.
The mangrove rail was formerly considered to be conspecific with what are now the Aztec rail (R. tenuirostris), Ridgway's rail (R. obsoletus), the king rail (R. elegans), and the clapper rail (R. crepitans), and more recently as conspecific with Ridgeway's and king rails. Worldwide taxonomic systems now agree that each of the five is a separate ...