An international team of researchers has found why and how egg-laying reproduction may have led to the extinction of dinosaurs. Tyrannosaurus rex, one of the biggest dinosaurs (Nobu Tamura) Weighing in at four tons, the mother animal was 2,500 times heavier than its newly hatched dinosaur baby. By way of comparison, a mother elephant, which is just as heavy, only weighs 22 times as much as its new-born calf. In other words, neonates are already big...
