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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- Do jellyfish have brains?
“Jellyfish have no brain, heart, or bones, and their bodies are about 95% water.”
Reference: Smithsonian Ocean
More from this shelf
What is the immortal jellyfish?
The "immortal jellyfish" can turn back into an earlier life stage when it's stressed, possibly letting it avoid dying of old age.
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.