ŽĖÐ on Instagram: "Marine biologists discovered that some fish can literally change their gender when the social hierarchy shifts — meaning a fish can wake up one morning and decide it’s taking over the whole squad. Parrotfish even sleep in mucus cocoons to hide their scent from predators, which sounds disgusting but honestly smarter than anything humans have done in the last decade. There are fish that use electricity to communicate, fish that climb waterfalls, and fish that spit jets of water