A Tetrapteron from James Cameron's film Avatar.
The tetrapteron (Na'vi name: fkio) is a class of flamingo-like birds that look almost Earth-like until one notices it has four wings, with two on either side. The tetrapteron also features a unique twin tail used for balancing its body weight as it hunts or lands.
They usually hunt in flocks. Of all the creatures on Pandora, these seem the most cooperative, both on the hunt and when socializing. While many predators on Pandora nurture their young, none take more care of their offspring with as much attention and duration as the tetrapteron. They eat fish as their primary diet.