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There are large droppings, as if a caterpillar has been at work, but I see none. I did see this mud thing (nest?) It is a little more than 1/4" across and a little deeper, with a very small opening into it. Any ideas what is living in here?
Here is a similar wasp nest, built in Australia, by the Mud-dauber Wasp - Sceliphron formosum. We were doing revegetation work in Morwell National Park and found these wasp nests on a stick supporting a tree-guard in the park. There were 6 or 7 of them, some still closed, so presumably with a wasp larva inside. This one was wide open and the wasp was flown.
I had one of the little round thingys on a window pane. The next day there were two, now I have three. I can see into the bottom of one, looking through the glass, and it looks like larva of some kind. I thought they might be Wasps because we have so many that build nests around here.
Kennedyh, that nest is less rounded than what I have. Mine also has an opening much smaller, relatively. Apparently the Delta campaniforme is also found in your neck of the woods. Mine http://www.geocities.com/brisbane_wasps/MudDauber.htm and a relative of yours http://www.geocities.com/brisbane_wasps/Palmdart.htm
Both are very similar looking, but the nests are very distinctive.
Dinu helps to show how universally adaptable these creatures are. They colonized the world, much quicker than we mere humans.
Patischell, I concur with your technical term, but I think it is spelled thingies. ;-}