This is the largest group of fish, including goldfish, tuna, trout, and catfish. They have skeletons made of bone rather than cartilage, and their bodies are covered by bony scales. ... Another type of bony fish, the lungfish, is unique among fish because, as the name suggests,they hav...
The limbs of horse legs have special tendons and ligaments to allow them to stand with almost no muscular effort, letting them stand for long stretches of time during periods of drowsiness. But contrary to popular belief, a full, deep sleep can't occur for a horse unless it is lying down...