Update on caterpillars

Remember those caterpillars that were eating our little lemon tree? Remember that I put them in one of our bug hotels to see what they do? Well, here are a few pictures that show you what they started doing. See those strings attaching it to the top?
This is what both look like after attaching and they still look like this after a week. They look like a piece of wood. It is amazing how well they would camouflage into a tree.

Now I have to look up for information on how long it will take for them to open up.