  Collagen is the main protein of connective tissue in animals and the most abundant protein in mammals,[1] making up about 25% to 35% of the whole-body protein content.I â¦ t is naturally found exclusively in metazoa, including sponges. [2] In muscle tissue it serves as a major component of endomysium. Collagen is the main protein of connective tissue in animals and the most abundant protein in mammals,[1] making up about 25% to 35% of the whole-body protein content.
The Southern Cassowary - The Most Dangerous Bird on Earth. Sunday, 1 September 2013. Ask a ten year old what the largest bird in the world is and the chances are you will get the right answer â the ostrich. Asked about the second largest and the odds are still very good that they will be able to name the Emu.
Largest Prey. 1  The wild animal known to have been killed and carried away by a bird was a 15 pound male red howler monkey killed by a harpy eagle (Harpia harpyja) in Manu National Park, Peru in 1990. The harpy eagle is considered the worldâs most powerful bird of prey, although it weighs only 20 pounds.