As I may have mentioned before, my son has an interest in birds. These were seen in Wainwright Field in South Portland on 7 October. According to BIRDS OF NORTH AMERICA, this "large, graceful sandpiper...undertakes a remarkable annual migration from its tundra breeding grounds in Alaska and Canada all the way to extreme southern South America."
That's a flight equal to roughly 16,000km - one way. Imagine what they see.