Many unique shark species are facing extinction - threatening ocean ecosystems and wiping out millions of years of evolution.

Large mammals in Yellowstone adapt to summer heat by changing behavior—shaped more by landscape than biology, a new study ...

New research shows that living in sync with your body clock may help reduce risks for heart disease, diabetes, and high blood pressure.

Rottweilers with lifelong hormone balance lived longer and faced less danger from frailty, showing how hormones shape late-life resilience.

Stone tools reveal that the First Americans followed a coastal route from East Asia, linking both sides of the Pacific during the Ice Age.

Scientists discovered that a tiny Panamanian bat hunts like a lion, catching large prey using sound, patience, and precision.

Women need about half as much exercise as men to protect their hearts equally, according to a large study using wearable fitness trackers.