Thanks to protective efforts in Russia, these critically endangered big cats have renewed hope of avoiding extinction.

In many Mexican cities, water is treated as a political bargaining chip – a favor that public officials can trade for votes, bribes or power.

Farmers don't like living near big predators like leopards, but new research shows the carnivores provide a vital ecological service.

Anyone who disregards the threats of climate change “is stupid,” says retired Lieutenant General John G. Castellaw.

The key to saving elephants and other species may lie in the DNA contained in their droppings, says conservation biologist Samuel Wasser.

Eco-books coming out this April look at the life and death of Cecil the lion, the history of oppressive oil development, and living a zero-waste lifestyle.

The Trump administration is backing away from treaty mandate to “give preferential attention to the solution of all border sanitation problems.”

Video: The big cats face a long list of threats, from climate change to habitat loss to the illegal pet trade.

The most famous rhino in the world has died, leaving behind two aging females and a hole in our world.

Disease outbreaks could be coming your way — our interactive map shows how you could be affected.