Digging the Scene: Dinos burrowed, built dens

Paleontologists have unearthed an ancient, sediment-filled burrow that holds remains of the creatures that dug it. The find is the first indisputable evidence that some dinosaurs maintained an underground lifestyle for at least part of their lives.

PROFILE OF A MUCKRAKER. An S-shaped mass of sandstone that contains the fossils of three dinosaurs (arrows, above) is hardened sediment that filled the burrow of Oryctodromeus cubicularis (below), a newly described dinosaur.