Adult platypuses typically have a length of about 15 to 20 inches (38 to 51 centimeters) from the tip of their bill to the end of their tail. Their tails are relatively short, measuring around 5 to 6 inches (13 to 15 centimeters). While size can vary among individuals, this is a general range for adult platypuses. Males and females are generally similar in size, although males may be slightly larger on average. These unique and semi-aquatic mammals are known for their small and distinctive appearance, with a combination of features that make them stand out in the animal kingdom.