Oceans

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

More Questions from Oceans
In what year did the International Whaling Commission declare blue whales to be a protected species because of a huge decrease in their population?
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Which of these oceanic zones allows photosynthesis?
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Which ocean is India closest to?
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What fraction of the Earth do oceans cover?
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What is the highest speeds dolphins have been known to attain?
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What does the Atlantic bluefin tuna eat at a young age?
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What is the third largest shark in the world?
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Who was Chief Engineer on the Titanic?
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