I don’t know what this fly is or does, and it’s maggot must be phenomenally large (flies, like many other insects with complete or holometabolous metamorphosis, don’t “grow” as adult—little flies aren’t babies, they’re likely just different species). On top of it’s size, there were pseudoscorpians hitching a ride on its legs (phoretic dispersal), so when it landed on our current, they began to climb down and investigate their surroundings!

I’ve seen some phoretically dispersed mites on dung beetles (an Instagram post I can’t link) and tabanid flies before too.