1. Institute of Laboratory Animal Resources, National Research Council. Recognition and Alleviation of Pain and Distress in Laboratory Animals (National Academy Press, Washington, DC, 1992).
2. Morton, D.B. & Griffiths, P.H. Guidelines on the recognition of pain, distress and discomfort in experimental animals and an hypothesis for assessment. Vet. Rec. 116(16), 431–436 (1985).
3. Stasiak, K.L., Maul, D., French, E., Hellyer, P.W. & VandeWoude, S. Species-specific assessment of pain in laboratory animals. Contemp. Top. Lab. Anim. Sci. 42(4), 13–20 (2003).
4. Karas, A.Z. Barriers to assessment and treatment of pain in laboratory animals. Lab Anim. (NY) 35(7), 38–45 (2006).
5. Bradley Bays, T., Lightfoot, T. & Mayer, J. (eds.) Exotic Pet Behavior: Birds, Reptiles, and Small Mammals (Saunders, Philadelphia, 2006).