Those things are aliens. Intelligent, and fast. I want to learn how to communicate with them, so they don't come for me in the night.
There was a lab where marine biologists were studying octopuses and other marine animals. Naturally, different animals were kept in separate tanks. Every morning, when they would come in, the biologists would find a few fish missing from their tank. The only clue they had was that the floor was wet.
Puzzled, they set up security cameras. The next morning, when they watched the footage.
What they found out was: The octopuses waited for the humans to leave, then crawled out of their tanks, across the floor, up and into the fish tanks, ate some fish, then crawled back to their tanks so they humans wouldn't catch them the next morning being where they weren't supposed to be.
Octopi can survive out of water for several minutes at a time. They can squeeze through any hole as large as their beak (the only inflexible part of their bodies). They can and will open jars to get at the contents within. They are (kind of) jet-powered, able to move through water by jetting water out of themselves. Oh, and the main way they communicate? By rapidly changing their skin color. They use that ability both for camouflage and communication.
Good luck learning their language.
Amazing creatures. It's been suggested that the only reason they aren't as intelligent as dolphins is that so much of their brains are dedicated to keeping track of their eight arms