I have never seen it but I would bet that it is a solitary bee or wasp has built those cocoons in an available cavity that happened to be your empty bee equipment. Personally, I would carefully take them off and put them in a small cavity to emerge and go about their life as you go about yours.
Thanks for the reply.
Can't see what emerges from those cocoons because whatever that was, it has already emerged.
The cocoons are made of some kind of clay/sand glued together by that insect and I found it in a hive mounted on a trailer 1.5m above ground. And it is not the first time I find this in my hives.
This is why I think it is a pest and got me curious.
I was going to say dirt daubers. Though I have never seen a nest laid out as individual tubes like that. If you cut one open, you will most likely find it packed full of spiders for the larva to feed on.
We get those too, they like our gutters. Ive seen them attack all sorts of insects, including bees, bumble, not honey but I wouldn't put anything past them. They sting them which paralyzes them and then put them inside those cocoons to feed to their young. Ekk
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