Oceans

The only enemy to the orca or killer whale is which of the following predators?

More Questions from Oceans
When consumed over long periods of time, ocean water causes what in humans?
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When was the Titanic officially launched?
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The longest river in Europe flows into what sea?
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The world's largest artificial reef, the U.S.S. Oriskany, can be found in what ocean?
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The pool at the foot of a small water-fall in a river is called what?
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Who built the ship RMS Titanic?
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Humpback whales use which of the following to trap krill, plankton, and or small fish like herring, mackerel, capelin and sand eel?
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Approximately where is the blowhole located on the head of a sperm whale?
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