When he inspected the image, he realized that eagle had a transmitter on its back.
That meant, in all likelihood, that it was Alice the Eagle, our local Bald eagle with a transmitter on her back. She is nesting nearby in Ridgefield Park.
Joe also took a photo of her on the nest yesterday, just after noon, from across Overpeck Creek. We have seen two eaglets in the nest. She is a busy mom. (Thanks, Joe!)