>>23159172
Dinosaurs, as known from extensive fossil records, varied greatly in size, from small feathered theropods (like Velociraptor, about the size of a turkey) to massive sauropods (like Argentinosaurus, over 100 feet long). These sizes are based on skeletal remains, which preserve accurate proportions and growth patterns. The fossilization process involves mineral replacement, not growth, so fossils don't "expand" over time.