Birds weren't the only thing Megan and I saw in Puerto Rico- Unbeknown to most of the vacationers at our villa, several trees in the playground area housed colonies of these bats during the day. They were really pretty big. Puerto Rico is known to be home to 13 different bat species- including the big brown bat. Perhaps this is what these are, but really, that's just a guess.
This is my contribution to this week's Camera Critters Meme.