A seal species with an inflatable bladder-like sac on its head that the males inflate during displays and when diving.
From 'bladder' + 'nose,' an English common name for the hooded seal (Cystophora cristata), named for the distinctive nasal structure of males.
Male bladdernose seals can actually inflate their nasal sacs to twice their body size in bright blue bubbles—a stunning display used for impressing females and intimidating rivals!
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