Cuttlefish could be the first animals shown to learn visually before birth or hatching, researchers say.
Cuttlefish embryos that develop in their translucent eggs with
crabs nearby hatch into youngsters with a distinct preference for eating crabs,
says Ludovic Dickel of the
The preference develops from sight alone, Dickel says. The researchers kept the crabs in containers that prevented crab scents from getting into the water with the eggs.
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