Flashback to 80 million years ago in the Gobi Desert. Deltatheridium scurried among dinosaurs. This cat-sized mammal had sharp canine teeth and triangular molars, much like those of opossums today. This early marsupial probably sunk its teeth into small lizards and insects.

Deltatheridium prerituberculare
Locality Found: Mongolia
Age: Cretaceous 80 MYA Size: 6 inches long
Prepared For: 2000 Museum exhibit Fighting Dinosaurs
Characteristics: Paleontologists believe that Deltatheridium was an early ancestor to modern day marsupials.

Image credits: courtesy of AMNH; quote. Mark Norell courtesy of Discovery Channel Online.