Via Dave over at the ESCONI Discussion Group:
A new study describes the common ancestor of all placental mammals. More info at:
http://www.scienced aily.com/ releases/ 2013/02/13020714 1458.htm
... the study details how researchers used both genetic and physical traits
to reconstruct the common ancestor of placental mammals, the creature
that gave rise to many mammals alive today. The data show that contrary to a commonly held theory, the group
diversified after the extinction of dinosaurs 65 million years ago...
And the abstract of the article in Science.
