They observed that birds that hatched during the pandemic, when the campuses became empty and there was less food waste to feed on, had beaks with higher bill length and slimmer structure, similar to the wildland birds. However, after the COVID-19 restrictions were lifted and people started trickling back to campus and food waste became ample. Birds born during this period reflected this shift, exhibiting shorter, thicker beaks typical of urban juncos.

The Study: https://www.pnas.org/doi/10.1073/pnas.2520996122

[–] scytale@piefed.zip 21 points 2 days ago

Wow that is extremely fast. I wonder how many generations was it between changes.