Flocks can be as large as 100 but typically range from 5 to 20 birds in mid-Michigan. Winter flocks forage for food together and wander about exploring possible roosting sites like bluebird houses or roosting pockets.
Image via Wikipedia
I didn't know that. Thank you for responding so quickly. My husband is becoming fascinated with the birds that are visiting the feeder.
I'm glad I could help. Feel free to write again any time.