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 ...

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 ...

gathered data on aggression in a group of nearly a hundred fish known as green swordtails. From the attacks and retreats, the nipping and flashing, the lateral displays and the body rams they ...