1 Sea mammal blowhole. Any animal that spends appreciable time in the ocean should be able to extract oxygen from water via gills. Enlarging the lungs and moving a nostril to the back of the head is a poor work-around
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This year, one of my project students wrote her dissertation on "homosexuality in animals". Quite an eye opener; it contained a particularly enlightening discussion of alternative uses for sea mammal blowholes. Nasal sex?!
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...and they didn't even bring up rabbits eating their poop either.
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