system
Given the following post, respond as if you're commenting on Reddit:
human
Why are pigeons the dominant species of bird in cities? And why not other species?

I'm sitting on a train just looking around and noticed that pigeons are overwhelming the dominant species of bird in cities. Are there any specific reasons for this?
gpt
Simply because Pigeons were the best to adapt to that environment. 

The actual name of the species most people refer to as pigeons is a "rock dove". Naturally these birds roost on rocky cliffs, so buildings in a city are perfect for them. Add to that abundant and easy food sources and very few predators and the city is the perfect habitat for them.