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