I WONDER - Where Did The Quetzalcoatlus Lay Its Eggs?

Quetzalcoatlas, a prehistoric flying animal, was discovered in Texas. It lived in a tropical coastal habitat around 100 million years ago. Despite its enormous size, it was lightweight due to its hollow bones. Its streamlined frame made it the largest known flying animal.

What features contributed to the lightness of Quetzalcoatlas?

What was unique about the size of Quetzalcoatlas compared to other flying animals?