The fire burned more than 1,000 homes outside Boulder, Colorado, in 2021. A series of surveys shows residents’ continuing health concerns, and tips for how to deal with smoke-damaged homes.

Rising carbon dioxide levels in the air are making plants grow larger and faster, but diluting their nutritional content. This could threaten the health of herbivores worldwide.

Will protecting monarch butterflies under the Endangered Species Act improve their chance of surviving? Not necessarily, 2 entomologists caution.

The Ethiopian wolf – Africa’s most endangered carnivore – has been found feeding on nectar.

Hippos are hard to study and dangerous to encounter.

Private conservation groups channel huge sums of money to parks and protected areas around the world, but often have failed to protect basic rights of Indigenous people living on those lands.

Colliding with ships is a top cause of whale deaths. A new study maps the areas of highest risk, showing where proven strategies such as speed limits and new shipping routes can reduce the toll.

Manatees along Florida’s coast are eating less seagrass and more algae than they did a few decades ago. This dietary shift could pose a new threat to the survival of the beloved species.

If social media serves as a funeral for extinct species, then Wikipedia pages have become their gravestones.

Hedgehogs that are out at night and appear healthy are best left alone.