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The Times of India

Others / The Times of India

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5 animals that sleep with one eye open (surprising reason why they do so)

Some animals sleep with one brain hemisphere while the other remains alert. This adaptation allows them to stay aware of their surroundings and potential dangers. Dolphins and mallard ducks exhibit this unique sleeping behavior for survival. Crocodiles and fur seals also utilize this strategy in different environments. Frigate birds even employ this tactic during long flights over oceans.

16 Jul 2026 6:19 pm