In Chaffee County we have noticed a difference as well this year. We noticed some very large flocks of Mt. Bluebirds in March but those seem to have disappeared now and resident birds that are often around nest boxes by this time seem significantly reduced. Mt. Bluebirds were one of the species that were found here as victims of the September snow event. We have a county wide nest box monitoring program here that may eventually provide some insight.
On Wednesday, April 7, 2021 at 5:50:13 PM UTC-6 <ouz......> wrote:
> We have not seen many bluebirds this spring, so I compared this year with > the three prior years' data. This year we have seen only one or two of > either species only once in a while. The last 3 years we saw them almost > daily starting in mid-March. > > This drop seems striking, at least along our road and on the trail we walk > regularly. Have others noticed this pattern? > > Hugh & Urling Kingery >