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The peacock spider performs elaborate courtship dances.

Male peacock spiders have colorful, iridescent flaps that they raise like a peacock's tail during courtship. They perform complex dances, including rhythmic movements and vibrations, to attract females. Each species has its own unique dance routine, making them the only known spiders to use visual displays in courtship.

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The sarcastic fringehead fish uses its giant mouth for territorial disputes.

When two of these fish fight, they press their huge, colorful mouths against each other, like an aggressive...

Read more: The sarcastic fringehead fish uses its giant mouth for territorial disputes.

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Some jellyfish have complex eyes without a brain.

Box jellyfish have 24 eyes of four different types, including eyes similar to human ones with retinas, corneas,...

Read more: Some jellyfish have complex eyes without a brain.

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Elephant seals can hold their breath for two hours.

These marine mammals can dive to depths of over 5,000 feet and stay underwater for up to two...

Read more: Elephant seals can hold their breath for two hours.