Unexpectedly photographed three triangle shaped objects

Me and my girlfriend was at Hudson Beach on January 13, 2022 at 5:54pm watching the sunset. I normally take pictures. This day, I was reviewing the pictures and noticed three triangle shaped objects exactly the same distance from each other with the one in the middle being higher than the two on each side. Look below the bird that flies in to the picture.I included the segment showed the three objects darting down towards the water simultaneously because my video was on live so i guess it takes a small video. I had no idea i was filming what I was filming until i reviewed the footage or else i would have focused on the objects. I havent done this sooner because its kind of un-usual but i guess someone should know