Migrating Terns

We were back at Lake Wilcox today to enjoy some sunny weather and a nice walk by the lake. On a floating dock were a small flock of birds, thought they were gulls at first but noticed the black caps and bright orange beaks, so I looked them up when I got home and they are either  Caspian or Arctic Terns heading north for the summer. Have not seen these birds before...a cool discovery!