Handbook of Psychology, Second Edition || MotivationWe thank A. E. Fink for producing the Predatory Imminence Continuum artwork in Figure . We would like to thank M. Tinsley for his contribution to the first edition of this chapter. We would like to thank Polar Bears Alive, Baton Rouge, Louisiana, for the use of the polar bear photo, M. Domjan for the quail photo, K. Hollis for the pictures of the fish, and S. Crowley for the pictures of the rats.