  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.
But this whole thing reminded us that raptors--the larger family of birds of prey including eagles, hawks, vultures, and owls--are crazy strong and also sometimes crazy big. So let's take a look at the craziest, strongest, and biggest raptor that ever existed: the Haast's eagle of New Zealand. The Haast's eagle is extinct now, and has been since, probably, around the year 1400, soon after the Maori first settled the South Island of New Zealand.