Baptornis -- Excellent 7mm tooth of a Cretaceous bird. See: Sankey, J. T.; Brinkman, D. B.; Guenther, M.; Currie, P. J. 2002. Small Theropod and Bird Teeth from the Late Cretaceous (Late Campanian) Judith River Group, Alberta. Journal of Paleontology 76(4), 762; fig. 5.35-5.38
