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Corvids display remarkable intelligence for animals of their size and are among the most intelligent birds thus far studied.), skills which until recently were thought to be possessed only by humans and a few other higher mammals.
Other lineages derived from these ancestors evolved into ecologically diverse, but often Australasian groups.You're using a web browser we don't support.To get the best possible experience using our new website we recommend that you upgrade to a newer version or other web browser.The corvids constitute the core group of the Corvoidea, together with their closest relatives (the birds of paradise, Australian mud-nesters, and shrikes).They are also the core group of the Corvida, which includes the related groups, such as Old World orioles and vireos.Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication.
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The earliest corvid fossils date to the mid-Miocene, about 17 million years ago; Miocorvus and Miopica may be ancestral to crows and some of the magpie lineage, respectively, or similar to the living forms due to convergent evolution.
The known prehistoric corvid genera appear to be mainly of the New World and Old World jay and Holarctic magpie lineages: Many corvids of temperate zones have mainly black or blue coloured plumage; however, some are pied black and white, some have a blue-purple iridescence and many tropical species are brightly coloured. Corvids have strong, stout bills and large wingspans.
The jays and magpies do not constitute monophyletic lineages, but rather seem to split up into an American and Old World lineage, and an Holarctic and Oriental lineage, respectively. The position of the azure-winged magpie, which has always been a major enigma, is even less clear than before.