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"keystone" species, meaning that they influence and affect many other species that depend <br />on their activities (bull snakes inhabit burrows, annual plants germinate in soil mounds, <br />Photo 1. Outlet from the swa <br />Photo 2. Sparse trees and invasive shrubs in a sea of reed canary grass <br />Friends of the Mississippi <br />35 <br />W.H. Houlton Conservation Area NRMP <br />