Guiraca caerulea

tags: Blue Grosbeak, Passerina caerulea, Guiraca caerulea, birds, mystery bird, bird ID quiz [Mystery bird] Female Blue Grosbeak, Passerina (Guiraca) caerulea, photographed at Quintana Neotropical Bird Sanctuary, Brazoria County, Texas. [I will identify this bird for you in 48 hours] [For your reference, here's a male of the species in breeding plumage] Image: Joseph Kennedy, 27 April 2010 [larger view]. Nikon D200, Kowa 883 telescope with TSN-PZ camera eyepiece 1/750s f/8.0 at 1000.0mm iso400. Please name at least one field mark that supports your identification. Review all mystery…