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Pufferfish, also known as puffers, balloonfish, or blowfish, are
well known to swell up into a ball-like shape as a defense
mechanism in order to appear larger and scare away predators.
They also have SpikesOfDoom to go along with it.  Some
pufferfish also have the added bonus of being pretty damn
poisonous to go with it. The majority of their bodies are
steeped in toxin, and if you were to eat one, you'd die pretty
dang quickly. Course, in places like Japan where people consider
them a delicacy, professional chefs have to be extremely careful
in cooking them.  Pufferfish have recently become a popular
aquarium pet due to their goofy appearance, curious personality,
and being rather intelligent as far as fish go (they are able to
recognize their owners and can learn basic tricks). Did we
mention they also like to be petted? However, due to their
specialized diets (They need to eat shellfish to