As a kid I brought home monarch caterpillars and put them in terrariums with fresh milkweed daily, resulting in up to 100 butterfly's hatching in the front yard. Back then it was still a bit of a mystery what they did, travel to Mexico and back again? I did a lot of reading and followed research as scientists tagged them and figured out their behaviors and habits. Some late bloomers would hatch when it was too cold and we would find Florida bound locals to shuttle them to warmer states for release. Since then I always check out what they're up to but no longer bring them in to grow in captivity. This year we saw the usual monarch egg laying, but it seemed like too many eggs were getting laid on single plants. Typically a monarch lays one or two per large plant, so that they have resources for survival. Instead they over loaded plants with eggs and the caterpillars have stripped entire plants before being full grown. This with more and bigger plants nearby. I speculate that as more local property is developed there are less milkweeds for the monarchs to lay eggs on. But the laying too many on small plants while fewer on other bigger denser milkweed patches is not typical monarch parenting behavior IME. Just guessing and more to the point I think those of us who love them might look around where they breed and maybe move some to better feeding ground if they look like they will run out of food before fully grown. Or not, if you think it's meddling with nature, maybe too many need to have their numbers reduced. Watering today I saw one walking across the lawn, which I never see, and saw stems where milkweed plants had been. So I dug out a screen lid aquarium, put in some sumac branches for chrysalis', and a couple of milkweed tops to eat. I think I put five or six of the biggest caterpillars in, from the almost gone plants they were eating. This spring up to now we have new summer homes being built below the flood tide line, because tourists are running out of lots to build on.