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As they grow they add concentric layers. They are arranged so as to overlap in a head-to-tail direction, like roof tiles, allowing a smoother flow of water over the body and therefore reducing drag. [3] They come in two forms: Cycloid scales have a smooth outer edge, and are most common on fish with soft fin rays, such as salmon and carp.
Scutes on a crocodile. Reptile skin is covered with scutes or scales which, along with many other characteristics, distinguish reptiles from animals of other classes. They are made of alpha and beta-keratin and are formed from the epidermis (contrary to fish, in which the scales are formed from the dermis).
It is common in fish, amphibians, reptiles, and many molluscs. [2] The term also refers to the pattern of hair growth sometimes seen in humans and a few domestic breeds, where hair continues to grow in length until it is cut.
Elephants have hair all over their bodies but unevenly scattered. Most of their hair is around their eyes, ears, chin, trunk tip, and the end of their tail.
The hairy frog (Trichobatrachus robustus) also known as the horror frog or Wolverine frog, is a Central African species of frog in the family Arthroleptidae.It is typically considered monotypic within the genus Trichobatrachus, [2] but based on its genetics, it should be included in Astylosternus instead. [3]
The scales however grow larger in size and may change shape with each moult. [9] Snakes have smaller scales around the mouth and sides of the body which allow expansion so that a snake can consume prey of much larger width than itself. Snake scales are made of keratin, the same material that hair and fingernails are made of. [9]
Non-venomous, these reptiles can grow up to 6 feet in length, so an appropriately sized habitat is essential. 25. Hermann’s Tortoise. Hermann’s Tortoise.
Stem mammals were all rather lizard-like, with sprawling gait and possibly horny scutes, while therapsids tended to have a more erect pose and possibly hair, at least in some forms. In traditional taxonomy, the Synapsida encompasses two distinct grades : the low-slung stem mammals have given rise to the more erect therapsids, who in their turn ...