From Today In Science History
Louis Antoine Marie Joseph Dollo was a French vertebrate paleontologist who stated Dollo's Law of Irreversibility whereby in evolution an organism never returns exactly to its former state such that
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgErkta2tKxZlHnG0MFpUY9ThhaSLf382DRjm275ZiHQ4HejZYU0WtDeg6nMm-GbLlgNWwpvs6-xCFPma8mkOqxxSomYzwM_8SKIw5qs8p2vxYPhXgW_xCSqAhwU8RDkRmpZ2k5/s200/dollo.jpg)
He began as an assistant (1882), became keeper of mammals (1891) at the Royal Museum of Natural History in Brussels where he stayed most of his life. He was a specialist in fossil fishes, reptiles, birds, and their palaeoecology. He supervised the excavation of the famous, multiple Iguanodons found in 1878 by miners deep underground, at Bernissart, Belgium. image