Figure 1 in Two heads are better than one: false head allows Calycopis cecrops (Lycaenidae) to escape predation by a Jumping Spider, Phidippus pulcherrimus (Salticidae)

Figure 1. False head in hairstreak butterflies: (A, B) Calycopis cecrops: (A) perching; (B) the disturbed butterfly turns its "false head" toward the perceived danger and initiates movement of hind wings. (C, D) Parhassius m-album: (C) intact freshly emerged; (D) wild specimen that has lost its "false head" in a predator attack.