 | A hummingbird-sized predatory bird is the smallest known dinosaur to live during the Mesozoic Era, between 252 million and 66 million years ago. Of modern birds the bee hummingbird is the smallest. The new species, dubbed Oculudentavis khaungraae, was similar in size. The earliest birds, such as Archaeopteryx, arose around 150 million years ago, and this find suggests that bird body sizes were reaching their lower limit by 99 million years ago. |
 | Tomography scans reveal a 3-D image of the bird’s skull, preserved in amber. They show the deep eye sockets and sharp teeth of a predator. Researchers need to figure out where the new species belongs on the tree of life. |  |
