I find them fascinating because even the pest type lays eggs in a precise order. It's kinda miraculous at times. I don't clear that kind of stuff until I see the little tiny praying mantis in late spring. They form little cocoons on the branches and vines. I also just want to know what kind of stuff is in my yard and if I should beware of it. As awful as bag worms are I've seen birds clean them up including the bag itself during a really bad winter. It's like God had given food for their survival.It's interesting, I love spotting unusual insects.
They are so often overlooked and not considered to be important, but many are vital pollinators and part of food chains for bigger animals.
I have a lot of overgrown brambles to clear but I'm worried I'll be killing a lot of caterpillars, so I've just contacted the butterfly/moth conservation organisation to see when the best time to do it will be. Hopefully won't be too long.