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The western population, the California least tern, was listed as an endangered species in 1972 with a population of about 600 pairs.With aggressive management, mainly by the exclusion of humans via fencing, the Californian population has rebounded in recent years to about 4500 pairs, a marked increase from 582 pairs in 1974 when census work began, though it is still listed as an endangered ...
The California least tern (Sternula antillarum browni) is a subspecies of least tern that breeds primarily in bays of the Pacific Ocean within a very limited range of Southern California, in San Francisco Bay and in northern regions of Mexico. This migratory bird is a U.S. federally listed endangered subspecies. The total population of the ...
In December 2019, the International Union for Conservation of Nature (IUCN) listed 8460 least concern avian species. [1] Of all evaluated avian species, 76.9% are listed as least concern. No subpopulations of birds have been evaluated by the IUCN. This is a complete list of least concern avian species evaluated by the IUCN.
Most species are pale grey above and white below with a contrasting black cap to the head, but the marsh terns, the black-bellied tern, the Inca tern, and some noddies have dark body plumage for at least part of the year. The sexes are identical in appearance, but young birds are readily distinguishable from adults.
Genus Sternula – F. Boie, 1822 – seven species Common name Scientific name and subspecies Range Size and ecology IUCN status and estimated population Little tern. Sternula albifrons (Pallas, 1764) temperate and tropical Europe and Asia. Size: Habitat: Diet: LC Least tern. Sternula antillarum Lesson, 1847
For a species to be considered endangered by the IUCN it must meet certain quantitative criteria which are designed to classify taxa facing "a very high risk of extinction". An even higher risk is faced by critically endangered species, which meet the quantitative criteria for endangered species. Critically endangered birds are listed ...
In this list of birds by common name 11,278 extant and recently extinct (since 1500) bird species are recognised. [1] ... Least storm petrel; Least tern; LeConte's ...
As of December 2020, the International Union for Conservation of Nature (IUCN) lists 1001 near threatened avian species. [1] Of all evaluated avian species, 9.1% are listed as near threatened. No subpopulations of birds have been evaluated by the IUCN. This is a complete list of near threatened avian species evaluated by the IUCN.