Yes and no: It depends on how you classify animals. There are two main classification systems – the Linnaean system which groups organisms by characteristics and the phylogenetics system, which ...

Think telling sparrows apart is just not worth the effort? Our tips might change your mind. Identify sparrows by habitat, range, season, field marks and more!

Birds are among the best-studied animal groups, but their prehistoric diversity is poorly known due to low fossilization potential. Hence, while many human-driven bird extinctions (i.e., extinctions ...