When they lose hair, mammals, including humans, are molting. Like feathers, a hair grows outward from a follicle in the skin and, as new hairs grow, old hairs will be lost. Under normal conditions in humans, hair loss will be a gradual process over an individual's lifetime and it does not occur all at once. Molting in many mammals is directly influenced by length of day and interactions between the endocrine system and the nervous system. The number of molts per year varies, and many mammals molt twice a year, once in the spring and once in the fall. Foxes, however, molt once a year in the summer, and the snowshoe hare molts three times: summer, autumn, and winter. In general, it is common for the summer coat of mammals to be thinner than the winter one, and it is not unusual for the two coats to be different colors. Changing hair color provides one method of camouflage. White fur lacks pigment and blends well with snow and light surroundings. In contrast, darker shades blend better in the summer and fall. In mammals, like other animals, the transition from juvenile into adult can be associated with a molt. Deer fawns, for example, have very pronounced white spots, but when they become further developed they molt into the solid coloration of adults.
See also: Amphibians; Arthropods; Birds; Crustaceans; Feathers; Flight; Fur and hair; Hormones and behavior; Hormones in mammals; Insects; Reptiles; Shells; Skin; Snakes.
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The best start to preventing hair loss is understanding the basics of hair what it is, how it grows, what system malfunctions can cause it to stop growing. And this ebook will cover the bases for you. Note that the contents here are not presented from a medical practitioner, and that any and all dietary and medical planning should be made under the guidance of your own medical and health practitioners. This content only presents overviews of hair loss prevention research for educational purposes and does not replace medical advice from a professional physician.