 However, “sociobiology” as a term existed well before Wilson, sometimes to refer to the kind of work identified by Wilson in the non-human animal part of his book: methodologically adaptationist approaches to understanding the causes and nature of non-human animal behavior (see for example, Schein 1956), but also occasionally to work of this kind in humans (for example, Ashley-Montagu 1940, Hentig 1948, Healey 1949). A few scientists also continue to use the term (for example, Hrdy, 1999, uses the term for this work in both humans and non-human animals). However, during the controversy over Wilson’s book and after most scientists using approaches to non-human animals shifted to using other terms, most commonly “behavioral ecology” (Krebs and Davies, 1978).