A group of sea urchins can harm the ecosystem here.


Disappearing Forest Before long, you arrive at a clearing in the kelp forest. T ere are only two kelp stems growing here. Why so few? You look down and make a discovery.


You see small, spiky creatures called sea urchins.


T ey are eating the kelp roots. Soon there will be no kelp leſt .


8 NATIONAL GEOGRAPHIC EXPLORER


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