Pufferfish look very, very, very, VERY cute, BUT… they can be quite dangerous! Once a pufferfish feels threatened, it sucks itself full with water, blowing up like a water balloon. Once he does this, spikes emerge from its body, making it a swimming spikeball. These spikes are very sharp an can inflict serious wounds. The inflation however is sometimes a last resort; puffers tend to die due to the stress it brings along. So never, ever try to provoke it!