A city square near the equator holds 42% fewer bird species.

At 65 degrees latitude, a city square loses only 12%, so urban growth hits tropical biodiversity hardest.

Tropical communities contain more habitat specialists, which cities exclude, while generalists like crows thrive, an analysis of more than 10,000 bird species found.

Overall, cities hold a third fewer bird species, and the pole-to-equator diversity gradient is 3 times weaker there.

How each outlet framed it
Phys.org
reports that the latitudinal diversity gradient is three times weaker in cities, analyzing 10,000+ bird species

Sources: Phys.org