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Baleen whales (Mysticeti)
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Despite having killed larger whales, besides whale calves, orcas have difficulty in chasing fast adult whales: https://www.nationalgeographic.com/news/...one-video/
Not only that, orcas do have enemies that can fight them, and they are humpback whales (Megaptera novæangliæ), which may not only fight to defend themselves or their calves, whether related or unrelated, though male humpbacks may harm calves by trying to woo their mothers (so their mothers would communicate with them in a secret, intimate manner to avoid being heard by males or predators, at least orcas), but also other marine mammals that orcas would prey on, such as seals, even if rarely and for reasons (such as that the humpbacks or their calves were attacked by the orcas beforehand): |
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