How many hearts does an octopus have?
An octopus has three hearts: two pump blood through the gills and one pumps it to the rest of the body.
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- What is a narwhal's tusk?
“A narwhal's tusk is actually a tooth that grows through its upper lip, and it's usually found on males.”
Reference: Smithsonian Ocean
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Can a narwhal's tusk sense things?
A narwhal's tusk may contain millions of nerve endings.
What is an "otter tail"?
The Labrador Retriever has a thick, rounded, tapering "otter tail" that works like a rudder, helping the dog steer while it swims.