system
Given the following post, respond as if you're commenting on Reddit:
human
Everyone knows that sharks can smell blood in the water. But are there any air-breathing animals that can smell underwater? Or water-breathing animals that can smell in the air?
gpt
Otters blow bubbles with their nostrils underwater as they stick their nose in potential food. They then suck the bubbles back in, in-order to smell if the thing they are investigating will be tasty. It’s pretty cool.