The more they eat, the more tentacles these sea anemones sprout

Almost every school child knows that cats have four legs, humans two, and spiders, a terrifying eight. Their number of limbs is immutable, set by their genetic code. But a new study suggests starlet sea anemones—part of a famously adaptable group of aquatic creatures known as cnidarians—have a leg up on them. They are the first species shown to grow entirely new limbs in response to food.

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