Pufferfish puff up like fuzzy balloons due to predator defence and stretching.
Pufferfish defend themselves by rapidly inflating their stomachs and displaying large spines, making it difficult for predators to swallow.
They possess tetrodotoxin, a dangerous toxin that can induce paralysis and death if consumed by a predator.
They also puff up to communicate with one another, signalling dominance and avoiding messes.
Male pufferfish show courtship by inflating up, with larger male pufferfish more likely to attract a partner.
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