The Blue Dacnis or Turquoise Honeycreeper (Dacnis cayana) is a small passerine bird and a member of the tanager family.
This bird has a huge range from Nicaragua to the south of Brazil. I have personally seen them at Cristalino and Laguna de Lagarto in Costa Rica but this is nowhere near an exhaustive list.
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Just look at the gorgeous blue on this hungry little guy!
Bird feeders with fruit will attract them.