Platypuses ‘sweat’ milk.

If you thought your sweat smelled rank after an intense workout, just imagine warm milk dripping from your brow while pumping iron. Thankfully, our fellow gymgoers don’t sweat milk, but there’s one animal that does: the platypus. Female platypuses ooze milk from their skin, which collects in the grooves and fur of their abdomens for their young to consume.

This quirk is due to the fact that platypuses have mammary glands like other mammals, though they lack protruding nipples or teats for milk to be consumed through. Instead, the milk sweat seeps from glands located just under their skin’s surface. Despite its inherent exposure to the elements, platypus milk has unique antibacterial properties that ensure it stays safe for nestlings to drink.