Most recent tests of the theory of disruptive coloration have focussed on the disguise of the body's outline (e.g. Merilaita 1998; Cuthill et al. 2005; Schaefer & Stobbe 2006; Stevens et al. 2006b; Fraser et al. 2007). When placed at the body's edge, the high-contrast colour boundaries that are characteristic of disruptive patterning create false contours of higher stimulus intensity than those of the real outline (Stevens & Cuthill 2006; Stevens et al. 2006a). In this way, the probability of object recognition through boundary shape is diminished. However, the pioneers of the theory of disruptive coloration, Abbott Thayer (1909) and Hugh Cott (1940), also emphasised the importance of concealing other characteristic, and thus potentially revealing, body parts, such as eyes and limbs. Cott (1940) devoted a whole chapter of his influential textbook to this topic, arguing that the successful disguise of such features could be achieved through what he termed ‘coincident disruptive coloration’ (Figure 3.1).