All of the Platypus's features serve a purpose. Their bill is actually one long snout full of sensory organs used to locate and scoop up food underwater. The webbed feet assist in swimming, digging, and paddling, and their dense fur serves as insulation. The tail also helps in swimming, and provides fat-storage. Adult Platypuses do not have teeth, and they will collect gravel to help chew food, which primarily consists of insects and crustaceans.
On top of laying eggs and looking weird, the Platypus is toxic! Males have venom-injecting spurs on their rear feet. It is believed that this venom is significant during mating periods.