Sea cucumbers look harmless but they have a dramatic way of fending off enemies. If a hungry fish comes too close, the sea cucumber shoots out streams of sticky threads which look like spaghetti. These entangle the attacker, giving the sea cucumber time to make a getaway.

Source: https://www.pitara.com/non-fiction-for-kids/did-you-know-for-kids/sea-cucumbers-look-harmless-but-they-have/

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Sea cucumbers look harmless but they have a dramatic way of fending off enemies. If a hungry fish comes too close, the sea cucumber shoots out streams of sticky threads which look like spaghetti. These entangle the attacker, giving the sea cucumber time to make a getaway.

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