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The integumentary system is often the largest organ system.  It distinguishes, separates, protects and informs the animal with regard to its surroundings. Small-bodied invertebrates of aquatic or continually moist habitats respire using the outer layer (integument).  This gas exchange system, where gases simply diffuse into and out of the interstitial fluid, is called '''integumentary exchange'''.   

The integumentary system is often the largest organ system.  It distinguishes, separates, protects and informs the animal with regard to its surroundings. Small-bodied invertebrates of aquatic or continually moist habitats respire using the outer layer (integument).  This gas exchange system, where gases simply diffuse into and out of the interstitial fluid, is called '''integumentary exchange'''.   

Generally mammalian skin is covered with hair and is termed hirsute skin.  Where hair is absent, it is termed glabrous skin.

Generally mammalian skin is covered with hair and is termed hirsute skin.  Where hair is absent, it is termed glabrous skin.The skin is an organ that shows many adaptations many of which are species specific - [[The Integument of Exotic Species - Anatomy & Physiology|exotic species]] such as fish, birds, reptiles and