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Defense In some mammals, such as hedgehogs and porcupines, the hairs have been customized into tough spinal columns or quills. These are covered with thick plates of keratin and work as protection against predators. Thick hair such as that of the lion's hair and grizzly bear's fur do offer some defense from physical damages such as bites and scratches.

Hairs can pick up motions of air in addition to touch by physical things and they provide sensory awareness of the existence of ectoparasites. Some hairs, such as eyelashes, are especially sensitive to the presence of potentially damaging matter. Eyebrows and eyelashes Eyelashes and eyebrows help to protect the eyes from dust, dirt, and sweat.

They also play a crucial role in non-verbal interaction by displaying feelings such as sadness, anger, surprise and enjoyment. In lots of other mammals, they include much longer, whisker-like hairs that serve as tactile sensors. The eyelash grows at the edges of the eyelid and protects the eye from dirt. The eyelash is to people, camels, horses, ostriches and so on, what hairs are to cats; they are used to notice when dirt, dust, or any other potentially damaging item is too near to the eye.

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Development Hair has its origins in the common ancestor of mammals, the synapsids, about 300 million years earlier. It is currently unidentified at what stage the synapsids got mammalian attributes such as body hair and mammary glands, as the fossils just seldom provide direct proof for soft tissues. Skin impression of the tummy and lower tail of a pelycosaur, perhaps reveals the basal synapsid stock bore transverse rows of rectangle-shaped scutes, similar to those of a contemporary crocodile, so the age of acquirement of hair logically couldn't have actually been earlier than 299 ma, based on the current understanding of the animal's phylogeny.

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The earliest indisputable recognized fossils showing unambiguous imprints of hair are the Callovian (late middle Jurassic) and a number of contemporary haramiyidans, both near-mammal cynodonts, providing th age as no later on than 220 ma based in turn on the modern-day phylogenetic understanding of these clades. This Site , research studies on terminal Permian coprolites may recommend that non-mammalian synapsids from that age had fur.