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What unique physical trait helps the Amazon river dolphin navigate easily through flooded forest trees?

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Correct answer: Unfused neck vertebrae

Unlike most marine dolphins, the Amazon river dolphin (or boto) has unfused neck vertebrae, allowing it to turn its head a full 90 degrees left or right. This incredible flexibility is crucial for maneuvering around tree trunks and branches in the flooded forest during the wet season. They also use echolocation to hunt fish in the murky, debris-filled waters. Photo: Oceancetaceen, Wikimedia Commons, CC BY-SA 2.0 de.

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Source: Wikipedia (CC BY-SA)

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