There were nine species of angusaiwéli. All were deep grey or black in color and had bright red eyes. The only notable distinction in the family was between those that ran on four legs (three species), those that ran on two legs (five species), and those that hopped (one species). The former group consisted of the species that lived near the water, especially along rocky seashores. All other angusaiwéli had exaggerated hind legs and walked upright, using their tails for balance. Astoundingly agile, they could travel over rugged terrain at speeds exceeding 35 miles an hour. The leaping unbird found in Khand and Chey was the slowest of these creatures; however, they were astoundingly efficient and needed less water and sustenance than other angusaiwéli.
Poisonous carnivores, unbirds hunted lizards, frogs, birds, large insects, and small mammals. They had very sharp teeth and curving, retractable, viper-like fangs. When facing most foes, though, they bit their prey while keeping these foreteeth hidden in pockets in their upper jaw. Angusaiwéli prefered to swallow their victims whole. Against larger foes, they could bear their hollow, needle-like fangs and puncture the unfortunate beasts' hides, injecting a potent venom that immobilized or killed .
Aside from its great speed, an angusaiwë relied on its cunning and horny body armor in combat. It had a ridge of pointed scales that protected its spine, and the scales on its back and sides were, as its name suggests, as tough as iron.
Retrieved from Realms of Arda; original reference: [ICE MERP 2012]