Do whales have Belly Buttons?

Index
baleen, baleen whales, belly buttons, beluga, blowholes, blubber, blue whale, bottlenose dolphins, bowhead whale, brain, breaching, calf, calls, dives, dolphins, dorsal fin, ears, echolocation, fin whale, fish, Flipper, flippers, flukes, gray whales, hair, harpoons, humpback whale, hunting, krill, migration, Moby Dick, narwhal, oil, orca, plants, pods, polar bears, pollution, porpoises, right whale, sei whale, sleep, sounding, sounds, spy-hop, squid, stranding, teeth, tongue, toothed whales, tusk, U.S. navy, vision, whalers