Sea otters have been used as an example of the "Keystone Species" concept.This means that sea otters

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Keystone species are species that have a disproportionate effect on their ecosystem relative to their abundance. Sea otters are considered a keystone species because they have a strong influence on the structure and functioning of their ecosystem. For example, they are top predators that help to control the density of sea urchins, which in turn helps to maintain healthy kelp forests. Without sea otters, sea urchin populations can explode and overgraze kelp forests, leading to a cascade of ecological effects on other species in the ecosystem.

Sea Otters Have Been Used as an Example of the "Keystone