PHPlatypuses don't have stomachs.
Platypuses are so bizarre that people originally thought that they were a hoax. But even though researchers are now more familiar with the critters, the animals are still nearly as unbelievable.
On top of having a bird-like bill and webbed feet, the swimming mammals don't have stomachs. National Geographic explains that if you take a peek inside a platypus, "you'll find another weird feature: Its gullet connects directly to its intestines. There's no sac in the middle that secretes powerful acids and digestive enzymes." (In other words, there's no stomach.)
(S) bestlifeonline