Whales
Whales are large, intelligent, aquatic mammals. They breathe air through blowhole(s) into lungs (unlike fish who breathe using gills). Whales have sleek, streamlined bodies that move easily through the water. They are the only mammals, other than manatees (seacows), that live their entire lives in the water, and the only mammals that have adapted to life in the open oceans.

Size
The biggest whale is the blue whale, which grows to be about 94 feet (29 m) long - the height of a 9-story building. These enormous animals eat about 4 tons of tiny krill each day, obtained by filter feeding through baleen. Adult blue whales have no predators except man.

The smallest whale is the dwarf sperm whale which as an adult is only 8.5 feet (2.6 m) long.

There 79 currently known species of whales around the world.

One of the most powerful preditor in the ocean and out of the 79 species of whales is the Killer Whale

 

  
Facts about the Killer Whales
  • Killer whales can weigh up to six tons.
  • Killer whales have 40 to 50 teeth that are up to four inches long.
  • The average life span of a killer whale in the wild is 50 to 80 years old.
  • Killer whales in the wild are considered one of the most powerful predators.
  • Killer whales eat seals, sea lions, whales, fish, squid and seabirds. Killer whales have been proven able to grab seals off of ice.
 
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