We still have a tailbone, which supports us while sitting, but we don’t have a visible tail anymore. Like whales and other marine mammals, these horizontal tails move in an up and down motion to propel the animal forward through the water. This means that their tails move in a side to side motion, cutting through the water like a rudder. The DNA to make a tail is probably contained in most mammals, expressed or not. If you look at wild cats, ones that run very fast have longer tails.” “Similarly the tree-dwelling monkeys of Africa and Asia, such as macaques, have long tails, which they use for balance, as they move around on all fours.” Mammals without visible tails, like humans, do have a coccyx referred to as a tailbone that does not protrude externally. A human embryo does have a tail but is absorbed into the fetus during gestation. All mammals are vertebrates so they have spines. Grazing animals such as elephants, zebras and giraffes have long, thin tails with a tuft of hair on the end. In mammals, a tail is the part of the body that corresponds to the sacrum and coccyx. Brachiation, or “arm walking,” in which the animal hangs from branches and moves by a series of long swings, is an adaptation seen in gibbons. Humans however, along with our closest relatives, do much better without any tails at all, even small, which is why we specifically evolved to not have them at all. Well-adapted arboreal mammals frequently are plantigrade, five-toed, and equipped with highly mobile limbs. The humans had been listening in and they had turned green with envy. But even so, all mammals have tail bones. It was the post with the best photos of elephants breasts that I could find. Many mammals with prehensile tails will have a bare patch to aid gripping. A week later all the mammals had returned with coconuts. Most birds, mammals, reptiles, and even fish have tails. However, all animals use their tails for non-uniform purposes, although they mostly have to … PS — I'm sorry for the headline of the post I linked to. Dolphins, however, do not have this characteristic fish trait, as their tails align horizontally. The end of the spine is extended by many into a tail that may or may not be useful. (except the humans of course.) But humans and other apes don't, even though our close primate relatives do. Where there is no tail, there are often embryonic remnants, which like gills can hark back to before the mammals came along. Tails are mostly a feature of vertebrates; however, some invertebrates such as scorpions also have appendages that can be considered tails. I don't believe women are required to wear bras. (Fish tails move side to side; the tails of sea mammals move up and down.) The Creator Of The Universe was very pleased. This tail is most prominent in human embryos 31–35 days old. Now you know why humans don`t have tails. Animals have preserved their tails because they still have a use for them. “Tails in mammals often serve as a counter balance to the head and assist an animal in movement, especially running. As a reward he blessed the mammals with tails. However, only vertebrates are known to have developed prehensile tails. This has only one exception, the Kiwi bird (birds are technically reptiles). Some species, including many New World monkeys, have a prehensile tail, which is used like a fifth hand. Each mammal had a different tail. The coccyx, or tailbone, is the remnant of a lost tail. The marine mammals have been known to use their flippers to get the job done, and their mouths for so-called self-fellation. Something I could add is that all reptiles have tails as well. All mammals have a tail at some point in their development; in humans, it is present for a period of 4 weeks, during stages 14 to 22 of human embryogenesis. This bare patch is known as a "friction pad". 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