or lionfish. In the Amazon, the helmeted woodpecker (Dryocopus galeatus), a rare species which lives in the Atlantic Forest of Brazil, Paraguay, and Argentina, has a similar red crest, black back, and barred underside to two larger woodpeckers: Dryocopus lineatus and Campephilus robustus. This mimicry reduces attacks on Dryocopus galeatus from other animals. Scientists had falsely believed that D. galeatus was a close cousin of the other two species, because of the visual similarity, and because the three species live in the same habitat and eat similar food. Batesian mimicry also occurs in the plant kingdom, such as the chameleon vine, which adapts its leaf shape and colour to match that of the plant it is climbing, such that its edible leaves appear to be the less desirable leaves of its host. Müllerian Müllerian mimicry, named for the German naturalist Fritz Müller, describes a situation where two or more species have similar warning or aposematic signals and both share genuine anti-predation attributes (e.g. being unpalatable). At first, Bates could not explain why this should be so—if both were harmful why did one need to mimic another? Müller put forward the first explanation and mathematical model for this phenomenon: if a common predator confuses two species, individuals in both those species are more likely to survive. This type of mimicry is unique in several respects. Firstly, both the mimic and the model benefit from the interaction, which could thus be classified as mutualism. The signal receiver also benefits by this system, despite being deceived about species identity, as it is able to generalize the pattern to potentially harmful encounters. The distinction between mimic and model that is clear in Batesian mimicry is also blurred. Where one species is scarce and another abundant, the rare species can be said to be the mimic. When both are present in similar numbers, however, it makes more sense to speak of each as a co-mimic than of distinct 'mimic' and 'model' species, as their warning signals tend to converge. Also, the mimetic species may exist on a continuum from harmless to highly noxious, so Batesian mimicry grades smoothly into Müllerian convergence. The monarch butterfly (Danaus plexippus) is a member of a Müllerian complex with the viceroy butterfly (Limenitis archippus), sharing coloration patterns and display behaviour. The viceroy has subspecies with somewhat different coloration, each closely matching the local Danaus species. For example, in Florida, the