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The food taken by gulls includes fish, and marine and freshwater invertebrates, both alive and already dead; terrestrial arthropods and invertebrates such as insects and earthworms; rodents, eggs, carrion, offal, reptiles, amphibians, seeds, fruit, human refuse, and even other birds. No gull species is a single-prey specialist, and no gull ...
Preceding the species accounts, an introduction covers the book's species-level taxonomy, and gives general advice on gull identification, including ageing and moult, hybrid and aberrant birds, and the effects of lighting conditions, and plumage wear and fading.
The genus name is from Latin Larus, which refers to a gull or other large seabird. The species name smithsonianus commemorates English chemist James Smithson whose £100,000 bequest enabled the foundation of the institution that bears his name. [2] The taxonomy of the herring gull group is very complicated and much is still controversial and ...
The laughing gull (Leucophaeus atricilla) is a medium-sized gull of North and South America. Named for its laugh-like call, it is an opportunistic omnivore and scavenger . It breeds in large colonies mostly along the Atlantic coast of North America, the Caribbean , and northern South America.
The common gull (Larus canus) is a medium-sized gull that breeds in cool temperate regions of the Palearctic from Iceland and Scotland east to Kamchatka in the Russian Far East. Most common gulls migrate further south in winter, reaching the Mediterranean Sea, the southern Caspian Sea, and the seas around China and Japan; northwest European ...
They found 7,538 different species – roughly two-thirds of the over 10,000 known species on the planet. ... How do I identify birds? ... The U.S. Fish and Wildlife Service found that bird ...
The European herring gull (Larus argentatus) is a large gull, up to 66 cm (26 in) long. [2] It breeds throughout the northern and western coasts of Europe. Some European herring gulls, especially those resident in colder areas, migrate further south in winter, but many are permanent residents, such as in Ireland, Britain, Iceland, or on the North Sea shores.
The California gull (Larus californicus) is a medium-sized gull, smaller on average than the herring gull, but larger on average than the ring-billed gull (though it may overlap in size with both). Although named after California , it can be found annually across most of western North America, from the Canadian prairie provinces in the ...