Amerila

Amerila is a genus of moth in the family Arctiidae. A number of species in this genus have a special defence mechanism when they are in their adult stage. When disturbed, they exude a frothy yellow fluid from glands beside the eyes, while making a sizzling noise to ward off their attacker. Similar behaviour has been observed in fertilised females ...
Found on http://en.wikipedia.org/wiki/Amerila
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