The sole’s two eyes
A young sole swims much like many other fish. As it grows, its head changes shape. Its left eye moves over to the right. You can then see both eyes on the side facing the water, even when the fish is resting on the sand.
A little eel shaped like a leaf
Early in life, a European eel looks like a leaf you can almost see through. As its body becomes thin and round like a tube, it turns into a glass eel. It can even get shorter as it changes shape.
A swimmer that settles down
Some sea squirt larvae swim with a tail. Once a larva attaches to a rock, its tail gradually disappears. The adult sea squirt lets water flow through its body and filters out tiny particles to eat.
Before a sea star has arms
A baby sea star looks very different from a grown one. It swims using tiny hairs called cilia. As it changes into a young sea star, the parts it used for swimming disappear. On the seabed, it moves on little feet under its arms.
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