Taylor, A. H., Medina, F. S., Holzhaider, J. C., Hearne, L. J., Hunt, G. R., & Gray, R. D. (2010). An Investigation into the Cognition Behind Spontaneous String Pulling in New Caledonian Crows. Public Library of Science.

Taylor, Alex H., Felipe S. Medina, Jennifer C. Holzhaider, Lindsay J. Hearne, Gavin R. Hunt, a Russell D. Gray. An Investigation Into the Cognition Behind Spontaneous String Pulling in New Caledonian Crows. Public Library of Science, 2010.

Taylor, Alex H., et al. An Investigation Into the Cognition Behind Spontaneous String Pulling in New Caledonian Crows. Public Library of Science, 2010.