The 2016 AOU Supplement and the Costa Rica Bird List
10,000 Birds
JULY 23, 2016
Birders concerned with ticking off bird species from a list in North America already know all about the AOU Supplement. For folks who don’t put much emphasis on taxonomic issues and classification of the birds they see, let’s start by saying that we aren’t talking about something that adds extra vitamins to your diet.
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