  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.
1 Tiny poison dart frogs may only be one inch (2.5 centimeters) long, but they pack a powerful punchâof poison. 2  Weighing less than an ounce (28 grams), these frogs are considered one of Earth's most toxic, or poisonous, species. 3  For example, the golden poison dart frog has enough poison to kill 20,000 mice. Like all frogs, poison dart frogs are amphibians, a group of animals that includes toads and salamanders. 2  Poison dart frogs eat insects, including flies, crickets, ants, termites, and beetles. 3  A group of frogs is sometimes called an army.