Do any mammals other than humans have belly buttons?

While mammals do have belly buttons, they're a little harder to find. Since mammals are gestated inside their mothers, they are all born with umbilical cords. When they emerge, the mother chews off the cord with her teeth, leaving a flat scar that is less noticeable than a human's navel. read more

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

All mammals have belly buttons except monotremes (the egg-laying kind): platypus and echidna. Marsupials such as kangaroos, wallabies, and opossums, have belly buttons that are much smaller and harder to see because they grow over. 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