I did some more research and found that a sugar water solution (1 part sugar to 4 parts water) can substitute for the nectar that Monarchs eat. So I've been giving him sugar water a couple of times each day, helping him to eat by gently placing his proboscis, that looks like a coiled straw when a Monarch is not eating, in the solution. I gently and carefully uncoil his proboscis with a straight pin. Today, I also gave him water to drink and got some watermelon for him to eat, another good food source.
|Drinking the sugar water solution.|
|Drinking from a water-soaked paper towel.|
|This image shows the coiled proboscis.|