Here they are after we'd had them for a few days. In this picture they are a lot bigger than when we found them, but still have the same coloring.
This is what they look like now, as full grown caterpillars:
Hopefully we will be able to show you what they look like as butterflies in a few weeks!
Here is Henry's picture of a caterpillar. The caterpillar is saying "Mac," which is its friend's name (obviously!).