A tiny fish in the rivers of Mexico and southern Texas is rewriting what scientists thought they knew about evolution. The Amazon molly, an all-female species, has survived for roughly 100,000 years ...

In the rivers of southern Mexico and Texas, USA, there swims a silvery-scaled fish that seems impossible to exist according to 'evolutionary theory.' The adult body length is 4–7 cm, and all ...

University of Missouri researchers have shown how an all-female fish species called the Amazon molly defies the long-held belief that asexual reproduction is an evolutionary dead end. The key is gene ...