[Did you know that?] Octopus blood is blue

[Dude1x3]

Did you know that an octopus has three hearts beating inside its soft body?
 its blood is actually blue because it uses copper to carry oxygen?
an octopus can squeeze through any gap as small as its beak?
 these creatures can change their color and texture in less than a second?
 octopuses are considered one of the most intelligent animals in the ocean?
 they can open jars, solve puzzles, and even escape enclosures?
 each of their arms can act on its own, with its own mini-brain?
 most octopuses live only 1–2 years despite being so remarkable?
some species can even regenerate lost limbs completely?