cushion sea star


Slow but Fie ce Invertebrates don’t always get along.


A hungry sea star wraps its five arms around a mussel. T e squishy mussel may look safe inside its hard shell. But the sea star pushes and pulls on the shell. Finally, the shell opens. T e sea star gobbles up the mussel. Both the sea star and the mussel


are invertebrates. Yet they belong to diff erent groups.


Fantastic Five T e sea star has a hard, spiny skin.


It also has a body based on the number five. So do all the other animals in this group. For example, the sea star has five arms. T e prickly sea urchin is also in this


group. It has five pointed teeth. Spines cover its body. T e sea cucumber looks like a sausage with tentacles. It has five double rows of feet.


sea urchin


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