The tusks of the Asian elephant grow at a rate of about 6.7 inches per year. The two main differences between alligators and crocodiles can be found on the head. First, alligators have a wider head than crococilles. Second, in crocodiles both upper and lower sets of teeth can been seen when the mouth is closed. In alligators, only the upper set of teeth is visible when the mouth is closed.
Cheetahs are the fastest land mammal.
They can run at speeds up to 70 miles per hour. The peregrine falcon can dive at speeds up to 200 miles per hour. They do this by folding up their wings and dropping like a stone. In both cases, the animals use their great speeds to catch their food. In the past, zoos would catch animals in the wild either by shooting them with a dart filled with drugs that would make the animal sleep, or by catching them in a trap.