These seabirds by far are the most traveled birds. They come to the arctic regions for nesting in the summer and the migrate to antarctic regions for the summer in the southern region. Researchers suggest they migrate at an average of more the 44,000 miles, depending on the regions.
During the summer months in Iceland, arctic terns can be found everywhere near the bodies of water. They seem always being active through out the long summer day fishing, stealing and feeding the offspring. The chaotic feeding scenes are something hard to miss, especially when the adults came back trying to find their offspring on the ground. Its not unusual to see the adults landed next to the hungry chicks and realized the chicks are not theirs.
Adults and chicks are very vocal calling to each other. To the human ears the sounds are the same but I guess there are other frequencies specific to them and cannot be heard by us.
The adults, just like any others animals, are very protective. I got a few nipped when I tried to photograph them!