That's what I meant about wondering what it a similar day would have brought a few decades ago. And why did the declines have to happen before excellent digital cameras were invented?
I gave up on the birds when a polar bear at a house next to the park got ornery.
Ammon, Elisabeth M. and William M. Gilbert. 1999. Wilson's Warbler (Wilsonia pusilla), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu/bna/species/478