# Why the tropics lose the most birds when cities expand

- Source: Phys.org - latest science and technology news stories
- Published: 2026-11-08T01:30:01+00:00
- Category: Science
- Original: https://phys.org/news/2026-11-tropics-birds-cities.html
- Canonical: https://groundlevelnews.com/story/why-the-tropics-lose-the-most-birds-when-cities-expand-4fc4ab/

Tropical ecosystems are famous for their teeming, exuberant diversity. In fact, the dramatic increase in biodiversity from the poles to the tropics—known as the latitudinal diversity gradient—is pervasive across branches of the tree of life, and fossil evidence suggests it has existed for millennia.

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