Final answer:
Prominent 20th-century fossil hunter Jack Horner is known for discovering the first fossilized dinosaur eggs in the western hemisphere, contributing significantly to paleontology.
Step-by-step explanation:
One of the prominent fossil hunters of the 20th century was Jack Horner. Horner, a well-known paleontologist, gained recognition for discovering the first fossilized dinosaur eggs in the western hemisphere. His work sheds light on the importance of fossils in understanding evolutionary history, and despite the portrayal of fossil hunting in movies, the actual work often involves meticulous excavation and preservation techniques - a far cry from the glamorous adventures of fictional characters like Indiana Jones. Horner's work has contributed to our understanding of dinosaurs and evolution.