Fewer otters would have allowed sea urchin populations on which the otters preyed to expand and the urchins' grazing pressure on kelp forests to increase.
海獭的减少会使海胆的数量增加，因为海獭以此为食，从而增加海胆对海藻林的食草压力。
2
The bright red color of a fire urchin warns predators that its spines are poisonous. Seaotters are the major predators of sea urchins.
火海胆鲜红的颜色警告捕食者它的刺有毒。海獭是海胆的主要捕食者。
3
Aquarium workers rescue lost or hurt young seaotters and prepare them to survive in the wild.