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Fig. 2. Numbers of pinches required to elicit regurgitation in the caterpillars of
33 species of moths and butterflies. Those that deploy regurgitation as their
primary defense (primary-regurgitators) are shown in white, as their secondary
defense (secondary-regurgitators) in black, and those that do not use
regurgitation as a defense (non-regurgitators) are in gray.