Polidori, C., Matteo, F., Pesarini, C., & Francesco, A. (2007). Factors affecting spider prey selection by Sceliphron mud-dauber wasps (Hymenoptera: Sphecidae) in northern Italy. Animal Biology, 57(1), 11-28. * Fighting but not killing: Bradbury , J. & Vehrencamp, S. (1998) Principles of Animal Communicati