I have alway seen pictures of nests that look like your but around here I'm not sure of nest construction. After a big storm in the fall I often see very small and fluffy birds nest the size you would expect a HB to use. They aren't made of clay and such but rather pieces of a certain hard type of grass stems. No wide grass but rather the short and hard stems only. Do you think these are HB nests?
Saw our first two baby HB's at the feeder today. About half normal size but drank up and left in a hurry.