I had someone drop off a rooster once in the middle of a cold January night.We woke up and my husband told me the rooster was crowing. I said, "but we don't have a rooster." I went out to investigate and found a rooster standing in the pitch black in a snowbank. I grabbed him and brought him in to look him over. He had an older injury on his leg that was somewhat necrotic. He was just developing spurs so I knew he was young. I did NOT want a rooster. I went door to door trying to find his owner...no one fessed up. Amazingly over time, he recovered but always had a crippled leg. He lived to be 6 and fathered quite a few chicks. I had so much joy and fun watching my broody hen hatch them and care for them. I guess God knew I needed this even though I was majorly resistant! I do not understand how people can just abandon an animal and one that is injured even more so. We later determined it was likely an injury from a weasel because we had a hen that sustained a similar injury from a weasel.
I wrote and illustrated two graphic novels about Mabel, a chicken who thinks outside the egg...and Roo's story is featured and he is a main character. You can see all of the cartoons on my thread in the hobbies forum called "Mabel's World Cartoons."
https://www.backyardchickens.com/threads/mabels-world-cartoons.1645125/
Here are a couple of pictures of Roo and his injury.