Yes, male platypuses are venomous. They have a spur on their hind legs that can deliver venom. The venom is not lethal to humans, but it can cause severe pain and swelling. It is believed the venom is primarily used during breeding season when male platypuses compete with each other for mates.

The venomous spur is present only in adult male platypuses, and it is not found in females or juvenile platypuses. The spur is located on the inner side of the hind ankle and can be used in defense against predators or rival males.

It’s important to note that venomous spurs of platypuses are not used for hunting or subduing prey. Instead, they serve as a defensive mechanism. If you encounter a platypus in the wild, it’s best to observe it from a safe distance and avoid any interaction that may provoke it.