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Hooded seal
St-Lawrence Golf • Magdalen Island
© Mario Cyr

The generic name means "bladder-bearer" in Greek, from the peculiar inflatable bladder on the head of the adult male – this bladder hangs between his eyes and down over his upper lip in the deflated state. In addition, he can inflate a large balloon-like sac from one of his nostrils. This is done by shutting one nostril valve and inflating a membrane which then protrudes from the other nostril.