Newly described fossils from South America are rewriting the story of giant snakes, revealing that anacondas have been enormous for at least 12 million years and never went through a downsizing phase.

For a long time, the idea of giant animals has mostly been tied to dinosaurs on land. Oceans feel different, quieter, even though they hide their own deep history. Fossils occasionally hint at ...

In deserts, jungles and swamps around the world, snakes are waging a biochemical war against their prey. When a snake displays its fangs, it’s showing off one of evolution’s greatest weapons. This is ...