The bright red color of a fire urchin warns predators that its spines are poisonous. Sea otters are the major predators of seaurchins.
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。
2
Since the disappearance of seaurchins from the waters up the coast of South Florida, many coral reefs there have been smothered by the uncontrolled growth of algae.
自从海胆从南佛罗里达海岸的海水中消失后,那里有许多珊瑚礁被不受控制生长的藻类所扼杀。
3
Rock lobsters prey on seaurchins, and increased rock lobster densities coincided with significant decreases in urchins.