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A study of red-shouldered hawk home range and habitat use in southern California found average home range of 1.2 square kilometres (0.46 sq mi) and showed fair adaptability to human-altered landscapes, which is important as riparian forest habitat has diminished by 98% from 1850 to 1977 in California's Central Valley. [17]
The California quail is the official state bird of California. This list of birds of California is a comprehensive listing of all the bird species seen naturally in the U.S. state of California as determined by the California Bird Records Committee (CBRC). [1] Additional accidental and hypothetical species have been added from different sources.
At one time, the rufous-tailed hawk (B. ventralis), distributed in Patagonia and some other areas of southern South America, was considered part of the red-tailed hawk species. With a massive distributional gap consisting of most of South America, the rufous-tailed hawk is considered a separate species now, but the two hawks still form a ...
The American goshawk (Astur atricapillus) is a species of raptor in the family Accipitridae. It was first described by Alexander Wilson in 1812. The American goshawk was previously considered conspecific with the Eurasian goshawk but was assigned to a separate species in 2023 based on differences in morphology, vocalizations, and genetic divergence. [2]
The taxonomy is far from resolved, with some authorities considering the southern taxa to represent three separate species: white-breasted hawk (A. chionogaster), plain-breasted hawk (A. ventralis), and rufous-thighed hawk (A. erythronemius). [3] The American Ornithological Society and some other checklists keep all four species conspecific. [4]
Historically, the birds entirely disappeared from areas where agriculture displaced the natural flora and fauna; for example it was noted in 1916 that the species was "practically extinct" in San Mateo County, California. [2] Studies have found that prairie dogs can be a main prey item for ferruginous hawks, linking them to the populations of ...
The forests of Northern California are home to many animals, for instance the American black bear.There are between 25,000 and 35,000 black bears in the state. [6]The forests in northern parts of California have an abundant fauna, which includes for instance the black-tailed deer, black bear, gray fox, North American cougar, bobcat, and Roosevelt elk.
For species found in the 50 states, Puerto Rico, and the U.S. Virgin Islands, the taxonomic treatment (designation and sequence of orders, families and species) and nomenclature (common and scientific names) used in the list are those of the AOS, the recognized scientific authority on the taxonomy and nomenclature of North and Middle American birds.