Predatory digging behavior by dinosaurs Simpson, E. L. ; Hilbert-Wolf, H. L. ; Wizevich, M. C. ; Tindall, S. E. ; Fasinski, B. R. ; Storm, L. P. ; Needle, M. D. Abstract Publication: Geology Pub Date: August 2010 DOI: 10.1130/G31019.1 Bibcode: 2010Geo....38..699S