Second most destructive critter God put on earth
Number one is the ubiquitous Racoon. Taking number two on the list is the mud dauber wasp. They build mud blocks in every hole they can find. Propane tanks, the outlet and vents get full. Water hoses are another favorite. I put in gas line to feed the generator a few yeas back and got zero flow. Turned out a mud dauber had built a nest in the 1/2 pipe before I installed it and plugged it up completely. Air hoses hanging on the rack get plugged electrical boxes with holes will get filled up too. I found a big nest in the roll of duct tape I carry on my zero turn mower's radio box.
I just killed the 100 amp power to the barn, did some wiring for my new deer blind and turned back on the breaker. Nothing happened. After a few tries it would turn on and sizzle a bit. After more fiddling it started to work but being cautious I pulled the breaker. Yup, a mud dauber got in and built a nest inside the breaker the sizzling I heard was the dead bugs it uses to feed its brood.
They can cause more headaches than anything their size, if they find a hole you can bet they will fill it with mud and dead bugs.