Octopuses
These tentacled undersea mollusks are some of the only invertebrates known to use tools. Jon Ablett, a senior curator of mollusks at London’s Natural History Museum, said: “As well as solving tasks using tools to get food rewards in the lab, in the wild octopuses have been shown to build little dens, and to use stones to create sort of shields to protect the entrance.” Some common blanket octopuses have even been known to use Portuguese man o’ war tentacles as weapons—that’d be like you using another person’s severed arm to slap people around.
