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What devours prey, lives in all oceans,but is playful with humans? It's the killer whale. Killer Senses Whales and Dolphins have hearing much better than us,the reason for that is they send out sound wave things that bounce off a target and that lets them know where it is. Blow Holes of the Ocean Do know why dolphins and whales have blowholes? It is because they are mammals and have lungs instead of gills. So, they need air like humans. They come out of the water and blow out the old air and get new air.
 * Fun Facts**

43% of all baby Orca's die in the first month of living. Scientists don't know why. Killer whales are actully the largest dolphin.