ScienceDaily for August 4, 2010 reported on a crocodile with mammal-like teeth.
"If you only looked at the teeth, you wouldn't think this was a crocodile. You would wonder what kind of strange mammal or mammal-like reptile it is," said study lead author Patrick O'Connor, associate professor of anatomy in the Ohio University College of Osteopathic Medicine.A Scientific American article is here.
A National Geographic Daily News article is here.
A LiveScience article is here.