National Geographic : 1942 Feb
© National Geographic Society Painting by Charles R.Knight Egg-laying Dinosaurs of Mongolia Grew Broad, Bony Collars to Save Their Own Necks An American Museum of Natural History expedition, led by Dr. Roy Chapman Andrews, in 1922, found a wholenest ofeggs, leftwhere they had been deposited millions of years ago by a female Protoceratops. Some had been crushed by sand. All had turned to stone. Theelated explorers brought back from Mongolia not only the eggs but a series of skulls, ranging from the embryo to the full-grown reptile, which may be seen at theMuseum inNew York.