Summary:
- During the COVID-19 lockdowns, urban birds in different parts of the world were observed to have evolved longer beaks, likely due to the reduced human activity and traffic.
- This change in beak size helped the birds access new food sources that were previously unavailable or more difficult to reach.
- Once the lockdowns ended and human activity resumed, the birds' beaks reverted back to their original size, demonstrating the flexibility and adaptability of these urban bird populations.