Male platypuses grow a sharp spur on each hind leg connected to venom glands. During the breeding season, venom production increases. A sting can cause excruciating pain to humans and deter predators. The venom is not lethal to humans but can cause swelling and temporary paralysis. Venom may be used in competition with rival males over mates. Females generally lack these spurs, making it a male-specific trait. This is one of the few examples of venom in mammals.
Venomous spurs illustrate unusual mammalian adaptations.
They play a role in mating success and territorial dominance.
The existence of venom in mammals broadens our understanding of chemical defenses in vertebrates.
Australian Museum (australian.museum)