i know when you see these in your compost or worm bin, you freak out. stop it. these are good. they are the larvae for soldier flies which really look like black wasps but don’t sting and aren’t wasps. they do however break down your compost for you and make it easier for your red wigglers to digest the rest of what is in the bin. a lot of people purchase them, but if you have an amazing compost, they just show up… at least they do for me. check out the article and learn all about soldier flies and good composting.