Here is a bird that I think is a sandpiper, although I could not find a bird exactly like this in my books about Costa Rican birds and wildlife. It is larger than most sandpipers, however, and it could be a gull. This bird was walking along the beach near the mouth of the Langosta estuary. Costa Rica has more species of birds than the USA and Canada combined, so I hope you will excuse me if I use that as an excuse to post this photo of a bird that I cannot positively identify. Perhaps someone can leave a comment to help identify the bird.