Happy World Octopus Day (Oct 8th, of course)! Here's some crazy facts about octopuses - because I love me a random fact, hope you do too 1. Octopuses are widely considered to be the most intelligent of all invertebrates. Scientists say octopuses are capable of learning from experience and maintaining short- and long-term memory. They’ve also been observed using tools in an intelligent manner — such as coconuts for personal fortresses. 2. Octopuses have three hearts and blue blood. Two of the hearts serve to move blood past their gills, while the third pumps blood through the rest of the body 3. Saying “octopi” is incorrect, it's octopuses (or octopodes) #sorrynotsorry 4. They're not called “tentacles,” they’re called ‘’arms”. Tentacles are reserved for squid, cuttlefish and nautiluses. Octopuses have eight arms, zero tentacles 5. Each arm has a mind of its own. Two-thirds of an octopus’s neurons reside in its arms, meaning they can react to stimuli and function at a fairly high level on their own, even when severed from the body.