Giant Dinosaurs Hatched with Adult-like Proportions (1 of 3) (image) American Association for the Advancement of Science Share Print E-Mail Caption Baby Rapetosaurus is compared to neonatal mammals. Rapetosaurus was only 35 cm tall at the hip, and weighed around 40 kg when it died a few weeks after hatching. This body size is similar to that of some large-bodied mammalian newborns: Black rhinoceros calves are ~ 35?45 kg at birth and stand a little taller at the shoulder than UA 9998 at ~ 65 cm. African elephants are close to a meter high at the hip and weigh between 90 and 120 kg at birth. Hippo newborns are the closest in both height and mass to UA 9998, checking in between 24?45 kg at birth with a shoulder height of 37 cm. This material relates to a paper that appeared in the April 22, 2016 issue of Science, published by AAAS. The paper, by K.C. Rogers at Macalester College in St. Paul, MN, and colleagues was titled, "Precociality in a tiny titanosaur from the Cretaceous of Madagascar." Credit D. Vital Usage Restrictions Please cite the owner of the material when publishing. This material may be freely used by reporters as part of news coverage, with proper attribution. Non-reporters must contact Science for permission. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.