Interesting articles!

I assume it's the aristolochic acid that gives pipevine swallowtail caterpillar poop that unique smell. No other cat poop has ANY smell that my nose can detect.

The only predators that ever bother pipevine cats, at least here, is the occasional stinkbug. And when a stinkbug does kill one, you can see that the fluid inside a pipevine cat is black, also unique - other cats are green inside.
I've never seen a wasp get near them - 'must be the AA.

Sherry