According to Wikipedia (which we all know is the source of all truth), the Arctic Tern sees two summers per year and more daylight than any other creature on the planet. They migrate from their summer breeding grounds in the arctic to winter in the Antarctic summer. They mate for life and usually return to the same colony each year.
They have quite the nasty little disposition, especially when a certain nosey bear dog starts poking her pointy snout where it doesn't belong. Of course instead of dive bombing said bear dog they attack said bear dog's OWNER.