Passerine birds.

Passeriformes, more commonly known as perching birds or passerines, are the most species-rich group of birds. Totaling nearly 6500 species, approximately two out of every three bird species is a passerine. Passerines are globally distributed and are among the most abundant birds at nearly every terrestrial location on Earth. Owing to their diversity, abundance and cosmopolitan distribution, passerines are among the most familiar of all birds and have figured prominently in both human culture and science. For example, humans have long been captivated by the beautiful songs of many passerines (such as the Common Nightingale (Luscinia megarhynchos) in Europe and the Wood Thrush (Hylocichla mustelina) of North America), and it is common in some cultures - although globally discouraged as ecologically damaging, especially when birds are captured directly from the wild - to keep passerines as pets. Nevertheless, the vocal prowess and frequent ability to thrive in captivity have made passerines important models for lab-based research ranging from neurobiology to genetics. In contrast, the diversity and accessibility of many passerine birds in the wild continue to make them among the best animal models for field-based studies of behavioral ecology, evolution, mating systems, life history, disease resistance, ecological and evolutionary responses to climate change, among many other fields.

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Declaration of interests The authors declare no competing interests.