From butterflies to blue whales, corals and worms, Earth is home to an incredible diversity of animals. How all of these ...

From homosexual penguins and sex-transitioning fish to pregnant male seahorses and sexually dominant female bonobos, thousands of species defy our expectations of gender and sexuality. Director Drew ...

The transgender creative discusses his new documentary, Second Nature, which shows how gay penguins and sex-changing fish are ...

Animal behavior is the scientific study of the observable actions, interactions, and behavioral patterns of animals, typically investigated within ethology, behavioral ecology, and comparative ...

While it was already known that human activity changes the environment, Phys.org reported that a recent study, published in the journal Science, has shown the effect of human activity on animal ...

A behind-the-scenes blog about research methods at Pew Research Center. For our latest findings, visit pewresearch.org. Over the years, Pew Research Center has asked Americans about the morality of ...

Animals that look happy, smiling, or content are instantly likable. Scientists debate whether those expressions mean anything, but most people don’t stop to question them. These are some reminders ...

No matter where you are in the world, the humans living there are about 90 percent right-handed while the remaining 10 ...

Who is responsible for negative behavior, such as sexual compulsions, that is driven by biological changes in the brain? Here ...

When Richard Dawkins’s first blockbuster book was published half a century ago, few genes had ever been sequenced or studied ...

Back when dinosaurs stomped the Earth, dinky mammals scurried about in their shadows. The little furballs, hiding out in underground burrows, provided a fresh niche for a novel reptile: the snake.

New research is shaking up our understanding of evolution by revealing that some species may not evolve gradually at all. Instead, scientists discovered that certain marine worms experienced an ...