They are generally club shaped, come in a wide variety of colors and patterns, and often have spikes.
Most puffers live in warm, tropical oceans.
They are wide ranging, and are found in the Caribbean, Pacific and Indian oceans. Some species of puffers can be found in fresh and brackish water though, such as streams, rivers, lakes, and estuaries. If I were another fish living in the same area with puffers, I would try to stay as far away from the puffers as I possibly could. People who keep aquariums almost never keep two puffers in the same tank unless they are trying to breed them, because puffers are very aggressive, especially to other puffers . People that keep puffers in tanks, though, feed them lance fish, brine, blood worms, prawns, and oysters.