Killer Whale ORCA
With sleek black backs and bright white bellies and eye patches, killer whales, or orcas, are easily distinguishable from other aquatic animals.
One of the ocean’s largest predators, male orcas can grow to 9.5 m (32 ft) in length, while females are slightly smaller at 8 m (23 ft). They live primarily where the water is cold but can live anywhere from the polar regions right up to the equator. This massive range makes orcas the most widespread of all sea creatures.
True to their name, killer whales are effective hunters. They prey on seals, sea lions, fish, sea birds, turtles, octopuses, and squid. Orcas will even attack other whales, including the enormous blue whale which can measure over three times their size. They have also been known to breach the surface to grab sea lions and seals, even partially jumping onto ice floes to reach their target.
Killer whales hunt in pods, or groups, in a way similar to wolves. They circle their prey and force them into smaller areas before attacking. Once cornered, the orcas take turns biting and ramming their prey.
Sending sound waves that travel underwater, killer whales use echolocation as a means for hunting. The reverberating sound provides information about an object’s location, size, and shape. Echolocation is also used as a form of communication. Each pod has a distinctive sound it uses to communicate among its members.
There are thought to be three types of pods: transient, resident, and offshore. Transient pods are constantly on the move following food sources. Resident pods generally stay in one area close to shore, while offshore orcas prefer the open waters. Currently, scientists are not clear as to why there are contrasting pod behaviors. Some believe it is because there are actually several species of orca, but more research must be conducted in order to test that theory.
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