Geography
I just noticed that if you search here on iNaturalist by the locations “Brooklyn, NY” and “Kings Co., NY” you get different results. This is odd because these boundaries are coterminous. The borough is the county and vice-versa.
Yet under “Brooklyn” on iNat, I have 15,433 observations/1,751 species. Under “Kings Co.” I have 15,645 observations/1,775 species.
@mollyopsis suggested that the difference is because of Brooklyn Bridge Park. The piers the park was built on are technically in New York County because that county’s boundary was drawn to the edge of Brooklyn across the East River. (Manhattan: full of itself since day one.) The bulkhead line is where Kings County ends. The piers came later. But this quirk of history is represented accurately on the outlines of the boundaries of both Brooklyn and Kings. (The boundary line for “Brooklyn Bridge Park, NY” fittingly includes the piers.)
So BBP's geographic oddity shouldn't count for the discrepancy. But then what does?
This discrepancy also occurs when all observations, including casuals, are taken into account: searching by Brooklyn, I have 16,305 observations/2,325 species; searching by Kings, it's 16,510 observations/2,350 species.
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