The Law of Diminishing Returns is an economics term that when applied to birding states... "When you reach a certain level on your yard list, you will no longer be able to add more than one species to the list in a day " Glad to say that as I reached 160 species on my list, my rate of returns still allowed me to add a pair of birds to my list today, when I added an Orange-crowned Warbler to my list this afternoon...
...to go along with the Trumpeter Swans that I added this morning.
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