Wildlife 'Red List' a grim tally of extinction threat

The world will get an update Saturday of the Red List of Threatened Species, the authoritative catalogue of how many of the planet's animal and plant species are teetering on the brink of extinction due to human activity.

EXPLAINER: What's making mid-Atlantic songbirds sick?

A mysterious ailment has sickened and killed thousands of songbirds in several mid-Atlantic states since late spring. While scientists are still racing to confirm the cause, it seems juvenile birds may be most susceptible. ...

Excess nitrogen puts butterflies at risk

Nitrogen from agriculture, vehicle emissions and industry is endangering butterflies in Switzerland. The element is deposited in the soil via the air and has an impact on vegetation—to the detriment of the butterflies, ...

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