A professor at the University of Colorado Denver says he's discovered fossils that are being called "love nests." Dr. Martin Lockley says scratches he's found in Colorado rocks look like a ritual modern male birds take part in. This pattern of scraping mirrors what some birds do today when selecting a mate. Dr. Lockley says most paleontologists agree that carnivorous dinosaurs are the ancestors of modern day birds.
The scratches have been found at Gunnison Gorge Conservation Area, Dominguez-Escalante National Conservation Area, places in the Montrose area, and Dinosaur Ridge south of Lakewood. Rubber molds and fiberglass copies of the scratch marks are being stored at the Denver Museum of Nature and Science.