All my caterpillars have pupated except for one. Should I wait to transfer them into my butterfly habitat?Updated 9 months ago

Your caterpillars are roughly the same age.  This last caterpillar just might need a little more time to ingest enough nutrients to make the transformation.

If you are still waiting for any large caterpillars to hang and your chrysalides have already been hanging for 3-5 days, you will need to transfer those chrysalides into the hatching habitat.  Replace the lid with some paper towelling, secured with a band, this will give any remaining caterpillars something to hang from, and once you are ready to move them to the habitat it can be pinned to the inside of the net.

If after waiting a few days, you still have a significantly smaller caterpillar, please release this one outside, ideally onto some nettles as for some reason it has not been taking in the nutrients required and will need to continue the cycle out in nature.