Chinstrap penguins are decreasing in numbers due to a lack of krill, their only food source.

Population reductions in species such as sparrows and blackbirds reflect a concerning pattern of declining biodiversity across the continent, researchers find.

In the last year, the butterfly’s eastern group has more than doubled its hibernation area while the other population waned. Plus, researchers are moving trees to save monarch habitat.

The increased risk is slight, but aligns with a longstanding hypothesis that having more cells in one’s body leads to more chances for those cells to become cancerous.

Unmanned aerial vehicles allow researchers to collect huge volumes of biological data cheaply, easily, and at higher resolution than ever before.

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.

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

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

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.

Sometime today, Earth’s 7 billionth person was born.

US border policy and fences threaten wildlife across the continent.