Very rare dinosaur egg nest, a total of 14 dinosaur eggs! The arrangement is very similar to that studied by paleontologists. Today's organisms may not find egg nests in this arrangement. Dinosaur Hadrosaurus or Therizinosaurus egg fossil (Because the eggs of Therizinosaurus and Hadrosaurus were both round and about the same size, it was difficult to tell them apart.). They date from the Cretaceous, 72.1-83.6 million years ago. They still have shell covering around surface. Large round eggs are characteristic of Hadrosaurus or Therizinosaurus and size of each is about 10*10 cm.