The size of a platypus bill can vary depending on the individual, but typically, it is around 5 to 6 centimeters in length. The bill of a platypus is one of its most distinctive features and plays a crucial role in its survival. It is covered in sensitive skin that can detect electrical signals produced by the movements of its prey underwater. The bill also helps the platypus forage for food, such as insects, worms, and small aquatic creatures.