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| Nests with embryos still inside the eggs and two-foot-long Hypacrosaurus babies were found in Montana. They would have grown to 25-foot-long giants. |  |
| Skeletons of hatchling Mussaurus were first found in Argentina in 1978. These toothy, mouse-size tots would have outstripped their name and grown more than ten feet tall. |  |
| A baby Bagaceratops breaks through his five-inch-long shell, looking more like a visitor from another planet than a relic from Mongolia. These winsome juveniles would have grown to four feet in length. |  |