Sentence:  By the official <WSD>count</WSD>, there are something like thirteen hundred species of birds in the Amazon, but Cohn-Haft thinks there are actually a good many more, because people have relied too much on features like size and plumage and not paid enough attention to sound. 
Meaning of the word marked with <WSD> tags:  The result of a tally that reveals the number of items in a set; a quantity counted.