Dung beetles are beetles that feed partly or only on the dung of mammals. They are a kind of scarab beetle. All these species belong to the superfamily Scarabaeoidea, and most of them to the family Scarabaeidae. The subfamily Scarabaeinae alone has more than 5,000 species.any dung beetles, known as rollers, roll dung into balls, which are used as a food source or brooding chambers. Other dung beetles, known as tunnelers, bury the dung wherever they find it. A third group, the dwellers, neither roll nor burrow: they simply live in dung.
Collagen is the main component of connective tissue, and is the most abundant protein in mammals, making up about 25% to 35% of the whole-body protein content. An atomic-force-microscopy image of collagen fibrils in a collagen fiber.t is mostly found in fibrous tissues such as tendon, ligament and skin, and is also abundant in cornea, bone, blood vessels, cartilage, intervertebral disc and the digestive tract. In muscle tissue, collagen serves as a major component of endomysium.
There are at least 16 types of collagen, but 80-90% of the collagen in the body consists of types I, II, and III. Type I collagen fibrils are stronger than steel (gram for gram). Collagen is most commonly found within the body in the skin, bones and connective tissues. The word collagen is derived from the Greek kolla, meaning glue. Collagen gives the skin its strength and structure, and also plays a role in the replacement of dead skin cells.