mysterious

For the Ragtag Daily Prompt: speculate.

We walked North Beach yesterday, 2 or 3 miles out starting at high tide 1:30 pm. There was a very large dead octopus on the beach. There were three bald eagles in the trees above and then more in flight, arriving for a chance at this meal. There was a pair of bald eagles flying in tandem and then this bird. The white wing tips are the clue. I can only find one very large bird in North America with the wings with white feathers at the ends, and it’s not an eagle.

Do you care to speculate? If I am correct, it is a long way from the Cornell Bird Lab map of where it is supposed to live.