The caterpillar of the spice bush swallowtail butterfly can produce a "strange" odor when disturbed.
Smelly Caterpillar
![Spicebush swallowtail caterpillar (Papilio troilus)](https://npr.brightspotcdn.com/dims4/default/847280a/2147483647/strip/true/crop/1024x571+0+0/resize/880x491!/quality/90/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2Flegacy%2Fsites%2Fwltr%2Ffiles%2F201710%2FSpicebushSwallowTailButterflyCaterpillar.jpg)
Michael Hodge
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Flickr
The caterpillar of the spice bush swallowtail butterfly can produce a "strange" odor when disturbed.