Yes, and tanchid are an important fly. However, they don't seem to have much issue in regards to population etc. I'm not exterminating nor killing the flies jus

Yes, and tanchid are an important fly. However, they don't seem to have much issue in regards to population etc. I'm not exterminating nor killing the flies just protecting the caterpillars. I still lose many caterpillars to the flies. In 2021 when I got 80 successful caterpillars I still had a ton that died from the flies. I was approximately 40% success rate with my caterpillars growing into butterflies the rest 60% died mostly due to the fly. Thus far in 2024 I have 23 dead from flies. With my other 4 hatched, 11 chrysalis, 12 caterpillars that's 46% dead from flies (thus far) I suspect some of the 12 caterpillars are already gotten by the fly so roughly ~50% dead to the flies thus far.