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Dragonflies use 80% of their brainpower just to process vision signals. They are capable of seeing everything around them without moving their eyes.

Animals

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Dolphins sleep with only one side of their brain, keeping one eye open and one eye closed. They surface every 20 to 30 minutes to breathe, and they are never totally unconscious while sleeping.

Animals

Out of all creatures on Earth the Giant Squid has the largest eyes; one eye can be as big as 11 inches (28 cm) across.

Animals

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