Skelhorn, J., Rowland, H. M., Delf, J., Speed, M. P., & Ruxton, G. D. (2011). Density-dependent
predation influences the evolution and behavior of masquerading prey. Proceedings of the National
Academy of Sciences of the United States of America, 108(16), 6532-6536. doi:10.1073/pnas.1014629108.