Frass...

Caterpillar droppings are a fundamental aspect of keeping these critters. Despite the sanitized scenes depicted in most of these shots, the scene of caterpillar feasting is, after a few hours, anything but sanitized. After all, they are following the Lepidopteran Dietary Guidelines and are consuming a Very-High-Fiber Diet, so they a have a rather substantial GI through-put.

Thus far, the most interesting aspect of the "frass" (yet another imaginative scatological euphemism!) is its cute dimple:

Anyone know what causes this? It's only on one side.

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