Mountain birds on 'escalator to extinction' as planet warms

A meticulous re-creation of a 3-decade-old study of birds on a mountainside in Peru has given scientists a rare chance to prove how the changing climate is pushing species out of the places they are best adapted to.

Hidden costs of disease to greater Yellowstone elk

For decades researchers have known that a bacterial disease in elk, bison and cattle in the Greater Yellowstone Ecosystem causes periodic abortions in these animals and chronic illness in humans drinking infected cow's milk. ...

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