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Introduction

The Passeriformes is the largest and most diverse commonly recognized clade of birds. The Passeriformes (or ‘passerine’ birds) are synonymous with what are commonly known as "perching birds"; this group also contains within it a major radiation commonly known as songbirds (oscine Passerines or Passeri). Of the 10,000 or so extant species of birds, over half (~5,300) are perching birds.

Perching birds have a worldwide distribution, with representatives on all continents except Antarctica, and reaching their greatest diversity in the tropics. Body sizes of passerines vary from about 1.4 kg in northern populations of Ravens (Corvus corax) to just a few grams. Perching birds include some of the most colorful and mysterious of all birds, such as birds of paradise from New Guinea and the bright orange Cock of the Rock from tropical South America. Because of their high diversity, generally small body size and relative ease of observation, collection and field study, perching birds have historically attracted the attention of a wide range of descriptive and experimental biologists, including systematists, behavioral ecologists, and evolutionary biologists.

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© Scott V. Edwards and John Harshman

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