I believe that this is a blue tanager. Blue-gray tanagers are more common and look like this bird, except with a gray body and blue wings. This is blue in both its wings and body. Therefore, I believe it to be a blue tanager, although my Costa Rican wildlife and bird books do not show a photo or illustration of a blue tanager.
After posting several photos about ugly ants, I figured I better show a photo of an attractive animal to try to redeem the visual appeal of this website.