Nature's "perfect balance" is a mystery scientists are trying to decode

"In the last 60 years, ecologists have discovered that specific animals have an outsized impact on the health of their communities."

"One of the chief points of The Serengeti Rules is that some species are more integral in striking this balance than others."

"If we lose those species, those communities can collapse, and if those communities are compromised, reintroducing or boosting those lost species can have positive effects on the overall health of the ecosystem."

"In the Pacific Northwest, the trees need salmon. What? The trees need salmon!"

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