A gray wolf standing between moss-covered tree trunks in a lush green forest, looking alertly to the side — Wolves, Period collection by Animals, Period. Wolf reintroduction in Yellowstone triggered a trophic cascade that reshaped river systems and helped recover dozens of species. Mexican gray wolves number fewer than 250 individuals in the wild.
A gray wolf standing between moss-covered tree trunks in a lush green forest, looking alertly to the side — Wolves, Period collection by Animals, Period. Wolf reintroduction in Yellowstone triggered a trophic cascade that reshaped river systems and helped recover dozens of species. Mexican gray wolves number fewer than 250 individuals in the wild.

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