A study finds two species of guenon monkeys in Tanzania have been mating and producing fertile offspring for generations.

Research suggests that the invasive, all-female Procambarus virginalis originated in a German aquarium back in the 1990s.

In an unusual evolutionary twist, local stick spiders have come up with an almost identical repertoire of color morphs in multiple locations.

Poecilia formosa, an all-female fish species, has a surprisingly robust genome. 

This discovery closes a 170-million-year gap in the fossil record.

Biologists’ walk in the woods sparks the creation of a masterful fruit fly field guide.