Grey wolves have long embodied the spirit of the wilderness. Once they had the largest natural distribution of any mammal except humans. Sadly, they can no longer claim this record as they have been lost from much of their former lands. Grey wolves still occupy a range of habitats including Arctic tundra, prairies and forests.
Although melanin is found in the skin of many species, in the reptiles, the amphibians, and fish, the epidermis is often relatively colourless. Instead, the colour of the skin is largely due to chromatophores in the dermis, which, in addition to melanin, may contain guanine or carotenoid pigments.kin of a different nature exists in amphibians, reptiles, and birds. All mammals have some hair on their skin, even marine mammals which appear to be hairless. The skin interfaces with the environment and is the first line of defense from external factors.
The dermis is mainly connective tissue but contains the pigment cells. The epidermis is characterised by scales that are covered with keratin. The skin of reptiles has numerous functions including display, protection, camouflage, thermoregulation and fluid homeostasis.The skin is dry, with few glands compared with mammals and amphibians.lands. Almost no skin glands occur in snakes, but coacal scent glands (anal glands) are present. They occur at the base of the tail, dorsal to the hemipenes in a male, and open into the posterior margin of the cloaca. The unpleasant odour of these organs plays a defensive role and may also carry social signals.