The platypus is a semi-aquatic mammal found in eastern Australia and Tasmania. It has a duck-like bill, webbed feet, and a beaver-like tail. The platypus lives in rivers and lakes, using its webbed feet to swim fast underwater while hunting small aquatic animals. On land, it walks awkwardly using its feet. Females lay eggs and care for their young until they can swim independently. Platypuses are playful creatures that live both on land and in the water.