Self-discovery in a hiding tree

A tree near me reveals its secret every winter. The secret being that, despite being on a small roundabout in a busy road, it is the home of several nests.
My perception of this being odd indicates that I have a limited mindset of what is appropriate or expected behaviour. Surely the birds would use the hundreds of trees in the park on the other side of the road.
If I limit the behaviour of birds in this way, how do I limit my own?