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Figure 1


Fig. 1. Defensive regurgitation of two caterpillars in response to simulated predation. (A) Saucrobotys futilalis, a primary-regurgitator, responds with a copious amount of regurgitant that it directs towards the simulated predator. The arrow marks a droplet of regurgitant. (B) Utetheisa ornatrix, a non-regurgitator, does not produce regurgitant when attacked.





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