No species is immune from the suffering of unrequited love, but scientists expect to learn volumes about the biological basis of sex from the newly sequenced genome of an all-female, asexual Texas ...

Females love males with big dorsal fins, but the appendages first evolved for males to fight other males To female molly and Limia fish, nothing is hotter than a male with a large dorsal fin. But ...

Female Mexican molly fish tend to go for big, colorful males, so what's a scrawny, drab guy to do? Scientists say he can flaunt bisexual behavior to bag a mate. Subscribe to read this story ad-free ...

They say that all’s fair in love and war, and that certainly seems to be the case of Atlantic mollies (Poecilia mexicana). These freshwater fish are small and unassuming, but in their quest to find ...

Soccer fans aren’t the only ones on Earth who make waves. By Veronique Greenwood In the sulfur-infused ponds of Tabasco State in Mexico lives a tiny silver slip of a fish, the sulphur molly. Toss in a ...