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Some examples of keystone species, and why they are considered keystone species Let us start by a pretty common example, such as the grey wolf (Canis lupus). This is an apex predator that feed on large herbivores such as moose, deer and roe deer, and are in many parts of the world important to keep these herbivore populations from growing too high.
The red wolf is considered a top predator and a keystone species. A top predator is one that is not eaten by anything else in the ecosystem, which means they have control over the prey populations in the ecosystem. A keystone species has a greater impact on the ecosystem than the number of individuals in that area.