The fish has 13 poisonous spikes along its back, used to look after itself.

Little fish will use it for shelter in the meantime.

It also grows a type of fungus on it's roots, which the fish can use for food.

This fish used to be one of the most common fish in the river.

These fish use their fins to move around in skips.

And a fish out of water could use every edge he could get.

When a target is noticed, the fish uses acceleration to chase it down.

Some fish may use sound to communicate with their young, and to signal danger.

Meat, poultry, and fish used to be considered the center of the plate, but in my house, they are treated more like side dishes.

Interestingly, many modern fish have kept their pocket single, and use it for a completely different purpose.