- The clutch size of Eastern Bluebirds varies with latitude and longitude. Bluebirds that nest farther north and farther west have larger clutches than southern nesters.
- In especially cold weather, several individuals will roost together in one cavity to stay warm. This species has been observed using nest boxes to stay warm during cold winter nights, packing 8-12 individuals into one box.
- The oldest known Eastern Bluebird in the wild was 10 years 6 months old.
Obsolete English Names: bluebird
Best places to see in Tennessee: Eastern Bluebirds are found in every county in the state. Many state and local parks have "bluebird trails" with multiple bluebird houses.
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