Strange parasitism or symbiosis

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Игорь обыватель, 13.07.2019 19:53

I appeal to specialists in wasps. I am a philistine in my own right, and I apologize in advance for my dilettantism.
The fact is that for a month I have been observing a strange picture at a dacha in the Moscow region. In the gap between the boards, the wasps made a nest for themselves. The wasps don't look quite ordinary. Thinner than ordinary ones, the head seems slightly larger than that of ordinary ones. The length is the same. The wasps recycle the wood and push the wood dust out...
They periodically bring with them flies of the same species (lean, gray, with a striped belly) - only once I saw a green one. The oddity lies in the fact that later, next to the entrance to these cracks, I observe the same" dazed " flies, which not only do not hurry to fly away, but crawl around and somehow try to lay their larvae in the tree. Another interesting thing is that flies do not lose their ability to fly. I watched as a fly of the same species arrived, crawling backwards back into the same slot... I've read that some types of wasps "zombie" cockroaches or caterpillars, but not flies. Once again, it is important that flies of the same species can, but do not rush to fly, if they fly away, they come and crawl back to the wasps.
If someone is interested, I will write in more detail and share the information.

Comments

13.07.2019 21:48, Hierophis

But the wasps carry flies of exactly the same species (except for one). I can send photos to your email address.

So I did not write that wasps drag flies of different types, just surprisingly, one of the flies brought by the wasps turned out to be different. But I don't really know about these wasps, how much narrow limits they have when searching for food for larvae.
I wrote that most likely flies of a different species enter the mink.
According to the photos, it is clear that this is a wasp from the family. Crabronidae, and some fly I don't know at all) I also don't know if it can be so that the same flies that the wasps catch lay something in the nests of the same wasps, it somehow looks wild

It remains for you to take a closer look or take a picture of the flies that the wasps carry, for this you can select one fly, and compare it with those that climb near the minks.