Figure 55.6 Truth in Labeling? (A) Batesian mimics are vulnerable species that gain protection by mimicking the warning signals of dangerous species. The appearance of the harmless blenny species Petroscirtes breviceps closely resembles that of the fanged striped blenny, which possesses a pair of grooved fangs with associated venom glands. (B) The shared warning coloration of Müllerian mimics is an honest advertisement of their toxicity. As caterpillars, all of the longwing butterflies (genus Heliconius) of South America feed on toxic passionflower plants and incorporate the toxins into their adult bodies. The Heliconius species living together in a particular region have similar warning coloration.