There are several key differences between male and female platypuses. Here are some of the main distinctions:
1. Size: Male platypuses are typically larger than females. Adult males can weigh up to around 2.4 kilograms (5.3 pounds), while adult females are generally smaller and lighter, weighing up to around 1.7 kilograms (3.7 pounds).
2. Spur: Male platypuses have a venomous spur on their hind legs. This spur is used during competition and aggression with other males. Female platypuses typically do not have spurs, or if they do, they are not as developed or venomous.
3. Reproductive System: Female platypuses have a cloaca, which is a single opening that serves as the opening for the urinary, digestive, and reproductive tracts. Male platypuses also have a cloaca, but they have an additional erectile organ called a "cloacal gland" located within it.
4. Milk Patches: Female platypuses have specialized milk patches on their abdomen. These patches secrete milk to feed their young, as platypuses are one of the few mammals that produce milk but lack nipples.
These are just a few examples of the differences between male and female platypuses. Overall, while they share many similarities, there are distinct characteristics that differentiate the two sexes.