Leaf Fish.

Asian leaffishes are small freshwater fishes of the Nandidae family, from Southern Asia. There are only four genera in this group.

They usually have small heads, coloration that appear evolved to resemble leaves and very large protractile mouths. Those features, along with their peculiar movements (seemingly intended to resemble a leaf innocently moving through the water) help them to catch fairly large preys compared to their bodies, including, specially, small fish, aquatic insects and other invertebrates. They tend to stay still in all areas of the water,perhaps to all predators of that chosen area.

Their odd leaf-like appearance, and unusual behavior, make them interesting fishes for aquarium hobbyists.