From frogs to salamanders to the axolotl, amphibians are the most threatened animal group in the world. Pollution, habitat loss and a pandemic-level fungus have brought countless species to the brink ...

While alligators and crocodiles share a fearsome appearance, key differences set them apart. Snout shape, tooth visibility when mouths are closed, and habitat preferences are crucial identifiers.

The Nature Index 2025 Research Leaders — previously known as Annual Tables — reveal the leading institutions and countries/territories in the natural and health sciences, according to their output in ...