Figure 3.

Monarch butterflies (Danaus plexippus) are poisonous and distasteful; this is advertised to potential predators by brightly colored wings. Photograph by Derek Ramsey, reproduced under GFDL 1.2 http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_ Documentation_License webcite.

Harvey Journal of Biology 2009 8:11   doi:10.1186/jbiol118
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