Fossils are providing more and more clues about how dinosaurs attracted one another and reproduced, which contributed to their remarkable ability to populate much of the Earth ...

This fossil exhibits a cloaca—a common cavity used for excretion and reproduction in modern birds, reptiles, amphibians, some fish, and monotremes. "It's almost certain that non-avian dinosaurs ...

Over the course of their history, the Romans built a complex and dense network of sewers in the city of Rome. However, only ...