A controversial hypothesis suggests that jellyfish may one day rule the oceans, and Mola mola may tell us if we are approaching a tipping point.

The agency is also poised to end a 50-year effort to restore endangered whooping crane populations.

Scientists report that thiamethoxam exposure impairs bumblebees’ reproduction and honey bees’ ability to fly.

A predictive population model suggests that lion populations in West, Central, and East Africa are likely to be halved in the next 20 years.

Researchers trace the mixing of human populations using DNA.

Meet a few robots that pose as flesh-and-blood critters to advance science.

Animal robots have become a unique tool for studying the behavior of their flesh-and-blood counterparts.

Women living in the 17th to 19th centuries had a slightly lower life expectancy if they gave birth to multiple sons, rather than to daughters.

As the human population expands, the number of rare genetic variants has dramatically increased.