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www.birds-of-north-america.net. Blue Birds The colour blue is found in many different species of birds. Some of the most attractive birds seen in North America fall into this category, such as the bluebird and the bunting families. The male Eastern Bluebird, the Indigo or Lazuli Buntings are examples of beautiful looking Blue Birds.
Biue is rare because those chemicals( pigments) which reflect blue are highly energy expensive . So for blue colour evolution comes in , and the blue butterflies , blue colour in peakock , blue feathers are not blue because they have chemicals but because of their structure .