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.
They live part of their lives in water and part on land. The early part of every amphibian s life is spent in the water. Amphibian eggs are laid and hatch in water. Much like fish, young amphibians breathe through gills in water and do not have legs.As they grow, amphibians go through a gradual change to develop legs, lungs, and other body parts in the process of becoming an adult.mphibians. Amphibians are often mistaken for reptiles.A toad is not a reptile and a snake is not an amphibian. The most well-known amphibian representatives are salamander, newts, frogs, toads, and caecilians.