Which of the following is an example of a keystone species? (select all that 2 points
apply) *
Beavers: Beavers are considered habitat engineers because they change the
environment by building dams. This dam building provides still water in which many
species flourish.
Mountain Lions: These predators cover large areas and influence many species. Their
prey will alter where they eat and live because of the mountain lion. Scavengers are
also affected by the mountain lion's activity.
Bees: By pollinating plants, bees contribute to their survival. The plants are shelter for
insects, which are then eaten by other species, like birds.
Wolves: Being a top predator, wolves are important in many habitats. Wolves keep
deer populations in check and too many deer will eat small trees, which leads to fewer
trees. In turn, there would be fewer birds and beavers and the whole ecosystem would
change.