Fish feast on a wide variety of food including worms, crustaceans and plants. But, some others—known as scale-eaters—prefer to rip the scales off of other fish and then eat them. In order to ...

The arapaima or pirarucu, native to the Amazon. (Jeff Kubina via Wikipedia [CC BY-SA 2.0 (https://creativecommons.org/licenses/by-sa/2.0)]) (CN) – The design of the ...