Domazet-Lošo, T., Klimovich, A., Anokhin, B. et al. (2014) Naturally occurring tumours in the basal metazoan Hydra, Nat Commun 5: 4222 doi:10.1038/ncomms5222

Haridy, Y., Witzmann, F., Asbach, P., Schoch, R.R., Fröbisch, N., Rothschild, B.M. (2019) Triassic Cancer – Osteosarcoma in a 240-Million-Year-Old Stem-Turtle. JAMA Oncol. 5:425–426. doi:10.1001/jamaoncol.2018.6766

Ujvari, B., Roche, B. and Thomas, F. (2017) Ecology and Evolution of Cancer, Academic Press, Cambridge, Mass. Chapter 2.

Shufeldt, R.W. (1919) A three-legged robin (Planesticus m. migratorius), The Auk 36: 585–586 doi:10.2307/4073388

Rothschild, B.M., Tanke, D.H., Helbling, M. et al. (2003) Epidemiologic study of tumors in dinosaurs. Naturwissenschaften 90, 495–500 doi:10.1007/ s00114–003–0473–9

Henrique de Souza Barbosa, F., Gomes da Costa Pereira, P.V.L, Paglarelli, L. et al. (2016) Multiple neoplasms in a single sauropod dinosaur from the Upper Cretaceous of Brazil. Cretaceous Research 62: 13–17 doi:10.1016/j. cretres.2016.01.010

Brem, H. and Folkman, J. (1975) Inhibition of tumor angiogenesis mediated by cartilage. J Exp Med 141: 427–439 doi:10.1084/jem.141.2.427

Main, D. (2013) Sharks Do Get Cancer: Tumor Found in Great White, LiveScience (published online 3 December 2013) bit.ly/2MMrp7V

McInnes, E. F., Ernst, H., and Germann, P.-G. (2013). Spontaneous neoplastic lesions in control Syrian hamsters in 6-, 12-, and 24-month short-term and carcinogenicity studies. Toxicologic Pathology, 41(1), 86–97 doi:10.1177/0192623312448938

Henwood, Chris (2001) The Discovery of the Syrian Hamster, Mesocricetus auratus, The Journal of the British Hamster Association 39 bit.ly/2szzCWh