Passerine Birds are More Colorful Close to Equator, Study Confirms

An evaluation of a photographic dataset for greater than 4,500 species of passerine birds reveals that female and male birds of tropical passerine species are usually extra colourful than their temperate counterparts. Is life usually extra colourful within the tropics? The potential existence of global-scale tendencies in organismal colorfulness was prompt by Nineteenth-century naturalists such […]