This morning I went out to change the bucket on my digger. It has two buckets, one narrow one for trenching and a wider one for moving dirt. There was a tiny bird sitting on the digger arm cussing me out and it did not fly away until I got quite close. Then I noticed there were two of them and I suspected I was near their nest. Sure enough they had built a nest in the arm of my digger.
I will postpone working on the digger until the nest is vacant. I managed to record the call of this bird.
Looking in my bird book this appears to be a house wren (Troglodytes aedon)