I was on a ride with friends near playa panama on culebra bay in the province of guanacaste, costa rica, we stopped to take pictures of the bay at about 14:00 we took several pictures and got on our bikes and rode home it was not until today 01/18/2017 that i uploaded and viewed them on my computer. after looking i found one picture that had an object in the right corner so i zoomed in on it, it does not look like a plane or a bird to me it has a distinct disk shape when zoomed in. i did not see it when the picture was taken or afterward only when i reviewed my pictures. the camera that i used is a sony cybershot set to auto so if it was a bird the auto focus would have picked it as being the closer object i think.