A flying guest

I have nailed a small bird nest on our wall outside hoping a few of them may desire to come and nest in it. But none has come so far.(Do you know why? Any suggestions to attract them or any experience to share?) The man who sold the nest told me that I have to wait a bit; "...they smell the human and won't come."

Today, a pigeon flew in through the open window and took a short rest in our house. When walking, I saw it had a problem in its left leg and walked lame.

This is the picture it let me to take.