Costa Rica—which received a 2019 Champions of the Earth award, the United Nations’s highest environmental honor, for its role in protecting nature and combating climate change—hosts plenty of ecotours ...

The see-through amphibians have an amazing strategy for hiding while asleep—one that could advance our understanding of blood clotting. The organs and developing eggs of a female glass frog, ...

I’m walking in the Eifel Mountains in western Germany, through cathedral-like groves of oak and beech, and there’s a strange unmoored feeling of entering a fairy tale. The trees have become vibrantly ...