Fewer otters would have allowed seaurchin 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
In the first century A.D., Pliny the Elder wrote of using seaurchin ashes to treat baldness.
公元一世纪，老普林尼曾写过用海胆的灰烬治疗来秃头。
3
The consequences of interacting with the array of sharp spines on a seaurchin or porcupine are pretty obvious to any creature passing by.