Beavers have a “double claw” on their hind feet that works like a comb to groom and oil their fur, helping it stay perfectly insulating underwater. They can also slap their tail to make a loud warning splash that alerts other beavers to danger 🦫

The dugong is a marine mammal related to elephants, and it spends its entire life grazing on seagrass on the seafloor, moving slowly like an “underwater cow.” When it surfaces, it can hold its breath for several minutes, and its slow lifestyle makes it a very discreet inhabitant of tropical coasts 🐋