At the main bus port of my city, you can see heaps and heaps of pigeons casually strolling right in front and even below the buses while they are still driving.

At the main bus port of my city, you can see heaps and heaps of pigeons casually strolling right in front and even below the buses while they are still driving. There definitely has to be learned behavior for the pigeons to be so completely devoid of fear in that situation.