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In this list of birds by common name 11,278 extant and recently extinct (since 1500) bird species are recognised. [1] Species marked with a "†" are extinct. Contents
The top grade, A, is given here for performance that exceeds the mean by more than 1.5 standard deviations, a B for performance between 0.5 and 1.5 standard deviations above the mean, and so on. [17] Regardless of the absolute performance of the students, the best score in the group receives a top grade and the worst score receives a failing grade.
There are an additional 146 species whose presence in the United States is only within one or more U.S. territories; some of those species have become extinct. The total number of bird species on the list is 1267 (i.e. the 1120 bird species found in the 50 states and District of Columbia, plus the 146 species found only in the U.S. territories).
A seven-page introduction is followed by a six-page chapter entitled "Avian Higher-level Phylogenetics and the Howard and Moore Checklist of Birds" by Joel Cracraft, F. Keith Barker and Alice Cibois, after which is a summary of the family structure used in this edition, in tabular form, giving numbers of genera and species. The bulk of the book ...
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Accipitridae is a family of birds of prey which includes hawks, eagles, kites, harriers, and Old World vultures. These birds have very large powerful hooked beaks for tearing flesh from their prey, strong legs, powerful talons, and keen eyesight. White-tailed kite, Elanus leucurus; Golden eagle, Aquila chrysaetos; Northern harrier, Circus hudsonius
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