Old Dogs

The story about mammals – little shrew-like creatures scuttling about under the feet of the dinosaurs until the Cretaceous extinction gave them (us) their chance – looks like it needs some revision:

A pair of “Mesozoic dogs” that hunted small dinosaurs 130 million years ago has been discovered in China, overturning standard theories about the earliest mammals.
The smaller of the two dog-sized fossils still has the remains of its last meal — a juvenile dinosaur — in its stomach area, while the larger is the biggest mammal ever found from its age.

Together, they prove for the first time that some primitive warm-blooded mammals were predatory carnivores that fed on other vertebrates, including small dinosaurs.