Numerous studies report declining bird numbers not caused by the typical threats of habitat loss or urbanization.

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. CAXIUANA NATIONAL FOREST, Brazil (AP) — A ...

Although rainforests cover only a small percentage of Earth's total surface area, they're home to half of the world's plant and animal species. As the name suggests, rainforests are also very wet: ...

CAXIUANA NATIONAL FOREST, Brazil (AP) — A short walk beneath the dense Amazon canopy, the forest abruptly opens up. Fallen logs are rotting, the trees grow sparser and the temperature rises in places ...