Wow! Thanks. That is just a prove of what I was thinking - if crowded, or popular places where people are always present, birds going to be used to that and could be good place to photograph them. That is a point for shorter, like 200mm lens, but yeah, in general, if I would like to walk in the woods, 300-400mm would be better.
To be honest, I'm not into birds, but I would love to photograph some owls!