Scientists in China have discovered two fossil mammals from the age of dinosaurs. One still had in its stomach the remains of its last meal--a baby dinosaur. The other mammal, the size of a modern dog, is by far the largest mammal known from this period.
These fossils are cool for a bunch of reasons. Complete skeletons are rare, and skeletons with stomach contents preserved are extremely valuable: they tell us who ate who, and how animals related to each other and to their environment.
And that's what's really interesting. We've known for a long time that
mammals and dinosaurs lived side-by-side. But before this all the
mammals we'd found were tiny, the size of chipmunks or shrews. They hid
during the day and came out at night to eat insects and seeds. The common
thinking was that primitive mammals couldn't compete with dinosaurs, and it
wasn't until the dinos went extinct that mammals could come out of the shadows
and grow large.
But now we have large mammals from dinosaur days. And they weren't timid
shrews--they were active hunters. Not only that, they hunted for
dinosaurs! Some scientists think these new predators may have influenced
What do YOU think?