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Sicalis flaveola
Liam is correct it is a Saffron Finch...for some reason I did not see the lower half of the species pictures in the Finch category. The below link from the same source will show you more pictures.
http://www.pbase.com/ahlman/finches
I cannot say for sure but the closest I could find is a Summer Tanager...Here is the link that has pictures to compare to....http://www.pbase.com/ahlman/tanagers....hope it helps