1 Hydrogen is the most abundant element in the universe. 2  Hydrogen isn't common in a pure form on Earth, but is mostly found as part of water. 3  Hydrogen is the main fuel of stars and the only fuel for red dwarfs. 4  The whole universe is thought to have been formed by a Hydrogen nucleus.
Noun. 1. hindlimb-a posterior appendage such as a leg or the homologous structure in other animals. hind limb. hind leg-the back limb of a quadruped. limb-one of the jointed appendages of an animal used for locomotion or grasping: arm; leg; wing; flipper. 1  Facebook.
These mammals have a fold of skin between the forelimb and hindlimb on each side of the body. By stretching out these wings, the animals can glide from tree to tree. Other mammals walk using legs such as cats, dogs, horses, apes and of course, people. Other mammals, particularly marine mammals, move through the use of flippers.