What animals have belly buttons?

As a result, your pets might not have the most obvious belly buttons. Chimpanzees and gorillas have ones similar to a human in shape, but they do not go in or out. Of course, there are always exceptions: platypuses and marsupials do not have belly buttons. read more

Animals who are mammals all have belly buttons, because these animals are all born from the mother. (Rather than animals like reptiles, who hatch from eggs.) Mammals have belly buttons because the navel is the spot on the body where a special tube used to connect the mother and baby, which was how the baby received food and oxygen before it was born. read more

UCL researcher Stacy Hackner explains that all placental mammals, aka those that were nourished before birth in the mother’s uterus, start with a belly button. However, most of these mammals (and certain humans) have their navels obscured by fur, fade over time, or have a thin scar or small bump instead. read more