evolutionary biology

This article explains how new species form without assuming prior background. It defines allopatric and sympatric speciation, breaks down their mechanisms, compares empirical ev...

Australopithecus refers to a genus of early hominins that lived in Africa between roughly 4.2 and 2.1 million years ago. As a direct ancestor in the human lineage, Australopithe...

Intersexual and intrasexual selection are two fundamental mechanisms within sexual selection, a form of natural selection that shapes how animals mate and evolve distinct traits...

Marine threespine stickleback (Gasterosteus aculeatus) repeatedly colonized freshwater habitats after the last glaciation, evolving distinct freshwater ecotypes adapted to lower...

Speciation—the process by which new species arise—depends on how populations become reproductively isolated. The two most widely contrasted modes are sympatric speciation an...