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In other cases, there are multiple peaks on the landscape, such as when there are different ways of adapting to the same environment. Beavers and platypuses both make slow-moving creeks and rivers their home, but they have very different traits. When there is more than one peak, we say there are multiple equilibria. This introduces contingency into evolution, since which peak an organism ends up climbing will depend on where it starts on the fitness landscape, how that landscape is shaped, and the randomness inherent to genetic mutation.