Indigo bunting  

Indigo bunting

This time of year, from late spring to summer, male adult indigo buntings take it up a notch and turn a brilliant deep blue. They fly up to a perch—like our cheerful fellow atop a branch—and sing from morning to night to defend their territory from other males and to catch the attention of females. Indigo buntings are members of the "blue" clade (subgroup) of the cardinal family.

© Vicki Jauron/Getty Images

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