A family of Eastern Bluebirds stays in the yard. The number varies, but it appears after the breeding season, the youngsters are chased away, and only one pair claims the yard. This has changed in the last few days.
Eastern Bluebirds stay year round in my area. In fact, they stay year round as far as the northern Mid-West, with those above that area moving south, or to the southwest. That, from past observations, didn't change the amount in my yard this time of the year, until this year.
I counted 21 Eastern Bluebirds on the power line this morning. That's a huge number, which made me do some research. Since my research only confirmed my past observations, this anomaly must mean some severe weather event forced large numbers to my area. Whether it's an isolated event, or a portent of a severe Winter is to be seen. Regardless, I have a feeling it's a rare occurrence, and a treat for the Winter. They're beautiful, and fun to watch.