The common green swordtail has a brown or red midlateral stripe that extends from the head to the tail. Some fish have two reddish stripes above and below the midlateral band. The swordtail is ...

The research team collected both sexes of two species of swordtail from the wild in Mexico for the study: green swordtails (which only have courting males), and high-backed pygmy swordtails (which ...

It's the look of love--when female green swordtail fish see attractive adult males, they mature faster sexually, researchers now find. On the other hand, scientists discovered when young male ...

When it comes to mating, dominant green swordtail fish let their tails do the talking. Female green swordtail fish mature faster sexually when they see males with larger-than-usual tails ...