As wild creatures go, pigeons are not among the most feared. But don't let their mild manner and ability to coexist with humans fool you. Pigeons are known to attack other birds and even humans if threatened, especially when they feel their nest is in danger.
So, what does a pigeon attack look like? Most pigeon aggression is directed toward other members of the flock, which has a strict hierarchy. Pigeons may also attack people if provoked. This may involve coming together as a flock to peck at a target, who can usually manage to get away without injury. The bottom line is that while feeding pigeons is OK, try not to make them angry. They may be small, but they probably outnumber you by at least a 20-1 ratio.