When wolves were reintroduced to Yellowstone National Park in the United States after being absent nearly 70 years, the most remarkable "trophic cascade" occurred. What is a trophic cascade and how exactly do wolves change rivers?

Posted 10 years ago by tommee in category: animals   Comments (0)

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This video was shot in the Sea of Cortez between Isla la Guardia and Bajia de los Angeles

Posted 15 years ago by boyt in category: animals   Comments (0)

Posted 13 years ago by Massandra in category: animals   Comments (0)