Oceans

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

More Questions from Oceans
Which ocean is among the traditional "Seven Seas"?
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In the Atlantic, hurricane season starts June 1, while in the Pacific it starts when?
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What two natural predators are known to prey on beluga whales other than humans hunting them?
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What keeps the salinity of the ocean the same throughout the year?
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What was the Port of Registry for the Titanic?
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What instrument uses sound waves to help get a picture of the ocean's bottom?
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A manatee is also known to be called what?
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What does wind cause on the surface of the ocean?
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