These two birds look almost the same from the front. The Blue Grosbeak has reddish-brown (called rufous) bars on the wings and light corners on the tail, whereas the Indigo Bunting is all blue and almost black with no markings. I hope this helps with an ID.
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Were you able to get any other pictures or observe the color of the wings?
This could be a male Blue Grosbeak, Guiraca caerulea : http://www.allaboutbirds.org/guide/Blue_...
http://en.wikipedia.org/wiki/Blue_Grosbe...
or a male Indigo Bunting, Passerina cyanea: http://www.allaboutbirds.org/guide/Indig...
http://en.wikipedia.org/wiki/Indigo_bunt...
These two birds look almost the same from the front. The Blue Grosbeak has reddish-brown (called rufous) bars on the wings and light corners on the tail, whereas the Indigo Bunting is all blue and almost black with no markings.
I hope this helps with an ID.