I just got done checking a wild bird board I frequent. The lack of hummers could have something to do with the feeders that more people are putting out as the birds migrate north they may chose to stop & nest in those areas. I hope there is it not some disease affecting their population or lack of habitat where they winter. I had two ruby throated females getting territorial over Canna plant blooms today. Early this spring there were two male hummers around the feeders but there aren't any around now which is strange, just the two females.