Wildlife Spotting

Very strange butterfly. Our botanist guide didn't know what it was and suggested it may be an unknown species. When he delicately picked it up for a closer look, it had an unusual defence mechanism. Over about a minute, it shot out a blast of very sticky foam about 80 cm long (like silly-string) from an aperture that opened on its head. The string had a strong chemical smell.

I know some butterflies are poisonous, and this has similar markings to many of the poisonous varieties (like the Monarch), but I've never heard of one that shoots poisonous silly string.