Some footage of a Monarch Caterpillar on Swamp Milkweed. They cane grow from 2mm to 2" in size. They can eat a milkweed leaf as fast as 4 minutes. They are amazing creatures that turn into amazing butterflies.
I have had so much fun watching these cats this year in my new butterfly garden. The ones I brought in have kept me busy making sure they have food! Luckily my swamp milkweed and tropical have started sprouting new leaves as I still have about 6 cats that are still feeding.