March 21: edit
- 1835 - Charles Darwin during the second voyage of the HMS Beagle, embarked on another voyage up the Andes near Valparaiso, Chile.
- 1972 - Louise Leakey was born in Nairobi, Kenya.
New Information on the Cranial Anatomy of Acrocanthosaurus atokensis and Its Implications for the Phylogeny of Allosauroidea (Dinosauria: Theropoda)
Drew R. Eddy, Julia A. Clarke
published 21 Mar 2011