P. S. by the way, I found out earlier this year that you can just feed fruit flies to birds directly. I had a surfeit of flightless fruit flies because, well, I was only feeding a few spiders who don't need to eat that often anyway.
It is only practical in the winter, when it is cold enough that the flies are immediately knocked out as soon as I put them on the windowsill (even though they are naturally flightless, they will still walk/climb away).
I mean Renfield is trying to accumulate as many lives as possible up the trophic levels, so he wouldn't consider it as efficient as flies → spiders → birds → cats, but I will probably do it next winter for getting rid of excess flies.
"Why keep flies in winter at all?" I'm glad you asked, Dr. Seward. Because I've had multiple experiences where I've taken in some predatory arthropod and needed to get fruit flies for it but the specialty pet store that sells them is a long bike ride away and closed because it's, like, Christmas Eve. So it's easier just to buy them in early winter and keep a culture going until spring.
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