A Bar-tailed Godwit with an implanted satellite transmitter was tracked flying nonstop from Alaska to New Zealand. It flew 7,250 miles over eight days with no food, water, or sleep. How something this size can store enough energy for such a flight is entirely unfathomable to me.
And if that isn’t enough: the adults migrate from the breeding grounds in Alaska sooner than the juveniles do. So the juveniles have to make their way to New Zealand, adjusting for five different wind systems to avoid being blown off course, without any guidance from experienced individuals.