Çağan Şekercioğlu was an ambitious, but perhaps naive graduate student when, 26 years ago, he embarked on a simple data-compilation project that would soon evolve into a massive career-defining ...

Birds are the most diverse land vertebrate on the planet, and now scientists have constructed a complete evolutionary tree of the 11,000 or so known species. This data came from hundreds of studies ...

Variation in seven example traits provided in BIRDBASE. Bars indicate the number of species within categories or subsets of each trait: (A) average body mass, (B) primary habitat, (C) primary diet, (D ...

Quick Take The Audubon Christmas Bird Count helps conservationists and scientists understand how many birds are in any given ...