Mouritsen, H., Derbyshire, R., Stalleicken, J., Mouritsen, O. Ø., Frost, B. J., & Norris, D. R. (2013). ‘An experimental displacement and over 50 years of tag-recoveries show that monarch butterflies are not true navigators’, Proceedings of the National Academy of Sciences, 110 (18). P. 7348–7353.