In a biological phenomenon unique among primates, an unflanged male can change to a flanged male for reasons that are not yet fully understood. Bornean and Sumatran orangutans differ a …

Sumatran orangutans are almost exclusively arboreal, living among the trees of tropical rainforests. Females virtually never travel on the ground, and adult males do so rarely.

Gorillas live in family groups of usually five to 10, but sometimes two to more than 50, led by a dominant adult male—or silverback—that can hold his position for years, if not decades.

Orangutans are distinguished by their long, muscular arms and gripping hands and feet, which allow the world’s largest tree-dwelling mammal to sway branch to branch.

We assist government and specialized organizations in rescuing orangutans from traders and from people who keep them illegally as pets. Many rescued orangutans are taken to refuges …

Photos and videos of wildlife, places, and nature from WWF.

Chimps share 98% of our DNA and use tools to survive. Learn how these intelligent, social animals thrive in the forests of Central Africa.

Learn how you can help protect nature through action, education, fundraising, and more. Every step makes a difference.

According to a WWF study, without mitigation efforts, projected sea-level rise—about a foot by 2070—could destroy nearly the entire Sundarbans tiger habitat.

Indonesia and Malaysia produce more than 85% of the world’s palm oil and are the only remaining homes to orangutans. Fewer than 80,000 of these animals survive today, their habitats under …