The larvae get quite big and are supposed to be good nutrition. Don't know if that nutrition holds true for the actual fly. I had a bunch of them in my compost pile a couple years ago but have not seen any since. The larvae didn't seem active enough to attract my FBT's attention and since FBT's don't have an extendable tongue, the fly would probably not get eaten. Not to mention the fly itself is probably too big for most FBT's from what I remember about them flying around my compost pile.
Shouldn't hurt to try. But if your frogs/toads don't eat the larvae, then try to find some data on the food value of the fly before you go overboard with them.





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