You should go read Ted Floyd’s post on the ABA Blog right now. It is pretty darn good and the conversation in the comments is worth reading as well, if only because a new term, “Schroedinger’s Gull,” has been introduced into the birder’s lexicon.
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I love “Schroedinger’s Gull.” I’d like to see the introduction of quantum mechanics to bird identification expanded to include my own theory, which is that birders assume that a bird’s physical structure is stable, and this is not true! That warbler you’re trying to identify, the one that might be a Blackburnian? And then you blink and look again and realize it’s definitely a Pine? It’s not you~! The bird changed itself!