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