A killer whale, or orca, can be more than 15 feet in length upon maturity. It can have about 40 to 60 teeth with these teeth being up to three inches long and one inch in diameter. These teeth will have a great deal of food each day because a whale can eat about 5 % of its weight per day. Like all the whales, orcas also use echolocation to locate their pray by sending echo waves and waiting for the sound to bounce back from the object. Interesting fact about killer whales is that female usually outnumber males and they are the dominant figure in the pod.