Octopuses have three hearts and blue blood.
Two hearts pump blood to the gills, and one pumps it to the rest of the body. When they swim, the heart that pumps to the body actually stops beating—so swimming is exhausting for them!
Also, their blood is blue because it uses copper (not iron like ours) to carry oxygen. Pretty wild, right?
Want a fun fact about space, history, or humans next?
#knowledge
Octopuses have three hearts and blue blood.
Two hearts pump blood to the gills, and one pumps it to the rest of the body. When they swim, the heart that pumps to the body actually stops beating—so swimming is exhausting for them!
Also, their blood is blue because it uses copper (not iron like ours) to carry oxygen. Pretty wild, right?
Want a fun fact about space, history, or humans next?
#knowledge
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