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Christmas Count explanation



Dear Members:

I have been surfing the web and comparing the results of all the
different Christmas Bird Count throughout the country. What I don't
understand is why so many counts have n/a beside the species count. Is
it not simply a matter of addding up the species seen on count day (or
count week as the case may be)? Is there some nuance that has escaped
me. Can anyone explain? 

Shantanu Phukan
C Hill