I have a story to tell you regarding my son getting tired during a walk which in return helped me find my pet bird!
I have a Quaker Parrot and about 10 years ago I stepped out on my back porch with him on my shoulder. The wind picked up and carried him away. He was so scared but managed to fly over a 2 story building and disappeared. His wings were clipped and he was unable to fly well but since it was windy it helped him fly. We had a small search team looking all over the place until after it got dark. I could not sleep most the night worrying about him. My son at the time was 10 years old got up and wrote a letter to God to please return him. The next day we got up at 8 am and walked all over town for hours looking for him. We decided to come home for a break and suddenly my son was giving out and just sat down. I was walking way ahead of him and looked back and hollered out loud, "Trevor, come on, we are almost home!" I suddenly hear my bird responding to my voice and he was chirping. (very distinct chirp from wild birds). I started calling my birds name, Bailey (named after George Bailey from It's a Wonderful Life) and he kept answering me. I followed the sound and found him in some bushes in an apartment building next to ours! Bailey looked up at me so sad like I threw him away. We still have Bailey, he can live to be 35 years old. Because my son got tired and gave up on the walk helped rescue my bird! If I hadn't hollered out loud my bird would not have heard me! cheesy The scary part is he was in some low bushes and could not fly well. Thankfully a cat did not find him first.
I pray all goes well with your son's surgery.