Hamadryas is a genus of medium-sized, neotropical, brush-footed butterfly species commonly known as cracker butterflies. They acquired their common name due to the unusual way that males produce a "cracking" sound as part of their territorial displays. The most comprehensive work about their ecology and behavior is that of Julian Monge Najera et al. (1998). The genus was erected by Jacob Hübner in 1806.

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