We have three bluebird species in north america. Bluebird have extensive ranges but the more confusing species have little range overlap.
Eastern Bluebird: Species Profile - Everglades National Park (U.S.
Not-So-Common Winter Birds
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Creature Feature: Eastern Bluebird - Raritan Headwaters
Eastern Bluebird - Montana Field Guide
Eastern Bluebird Identification, All About Birds, Cornell Lab of
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Eastern Bluebird Identification, All About Birds, Cornell Lab of
Creature Feature: Eastern Bluebird