In a changing ecosystem, Yellowstone grizzly bears are resilient

Grizzly bears in the Greater Yellowstone Ecosystem have been able to gain the body fat they need for hibernation even as population densities have increased and as climate change and human impacts have changed the availability ...

WHO urges vigilance but no alarm over bird flu

The World Health Organization called Wednesday for vigilance after the recent detection of bird flu in mammals, but tried to calm fears that large-scale human outbreaks could be looming.

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