Archosaurs are a group of reptiles that include modern birds and crocodilians, as well as their extinct relatives like dinosaurs and pterosaurs. They are characterized by specific features such as a hole in the skull in front of the eyes and a unique ankle structure. This group emerged during the late Permian period and became dominant during the Mesozoic era, often referred to as the "Age of Reptiles." Today, archosaurs are represented by two main lineages: birds and crocodiles. Birds are considered the only living descendants of the theropod dinosaurs, showcasing the evolutionary link between these ancient creatures and modern avian species. Meanwhile, crocodilians, which include alligators and crocodiles, have remained relatively unchanged for millions of years