Platypuses sweat the milk. They sweat the milk. To be more specific, the American Museum of Natural History (AMNH) writes that “the platypus [has] no nipples.” So, “Their milk oozes out of ...

The platypus (Ornithorhynchus anatinus) has a puzzling array of features. Not only does it have that iconic duck bill, it lays eggs like a bird or reptile but feeds milk to its young like a mammal.