system
Given the following post, respond as if you're commenting on Reddit:
human
Why are Pigeons so well adapted to living in cities?

Why is it that there are so many of them compared to other birds (except maybe Seagulls at the cost) and have they always been well adapted to city life or is it something that has evolved alongside cities?
gpt
The urban pigeons are rock pigeons, they originally nested in cavities on cliffs, big rocks, etc... The urban environment is quite similar to these, with vertical structure, holes everywhere, and other features. Add the abundance of food due to human garbage and the pigeon's adaptive diet and you get the perfect urban bird.