Inter-Vertebral Flexibility of the Ostrich Neck: Implications for Estimating Sauropod Neck Flexibility Cobley, Matthew J. ; Rayfield, Emily J. ; Barrett, Paul M. Abstract Publication: PLoS ONE Pub Date: August 2013 DOI: 10.1371/journal.pone.0072187 Bibcode: 2013PLoSO...872187C