Star-nosed moles can smell underwater by blowing bubbles.

Mammals smell by moving odor-filled air across nasal tissue, which seems useless underwater. Star-nosed moles found a workaround. While diving, they exhale tiny air bubbles onto objects or scent trails, then quickly inhale the bubbles again. The returning air carries odor molecules back to the nose. Experiments showed the method helped them follow underwater scent trails. This does not mean they smell water the way a fish senses chemicals. They are briefly bringing air to the odor and back again. It is snorkel-like olfaction packed into rapid bubble handling.

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