Keystone species play an outsized role in the ecosystem, affecting the natural balance in ways that cannot easily be replaced.

Ecologists have long understood that the diversity of an ecosystem is at the heart of its stability. A groundbreaking discovery in the 1960s took it a step further and changed the way scientists ...

Climate change has been the focus of much of the opposition to TransCanada's Keystone XL pipeline. But many conservationists are also concerned about more immediate environmental consequences. They're ...

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A new instance of just such an inter-species leap has just been discovered in Florida. Known as the Keystone virus, it is normally carried by mosquitoes between animals. But a 16-yar-old boy who ...

KEYSTONE HEIGHTS | They are the survivors. Each has a past typically filled with fear, cruelty, abuse or abandonment. Traces of wariness linger in their eyes and strangers are regarded with curiosity ...

If you were to compile a checklist of everything you need to build a successful softball team, Keystone checks off about every box imaginable. An elite starting pitcher? Check. An explosive offense?