Are there so many birds that cats don’t matter?
10,000 Birds
OCTOBER 16, 2012
which was a comparative look at apparent, visible, often in your face biomass we observe when we as diurnal primates look around us. In short, the answer is that in the United States there are 20 billion birds at the end of the breeding and fledging season, which gets winnowed down to 10 billion by the following early spring.
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