Science News reports that dinosaur fossils have been found in burrows.

The newly described dinosaur’s 1.25-m-long tail accounted for most of the slim creature’s estimated 2.1-m length. In adulthood, it would have stood knee-high to humans, says Varricchio. Broad flanges on the upper bones of the creature’s forelimbs indicate where large muscles attached, he adds. Similar features, which provide increased leverage while digging, are found on the analogous bones in modern-day armadillos.

The dinosaur’s broad hips suggest that it could have braced itself in a wide stance while burrowing. The foremost bones in its skull were fused, a characteristic that could have enabled the creature to dig more effectively.

 Link  via Boing Boing