1, 2, Check
You can recognize a racing pigeon by their rings, these rings include numbers which correspond with information about their owner and address. In case of a lost pigeon, check your national pigeon organisation and check the number on their website (in case they have a website). For instance in The Netherlands you can contact the NPO Veenendaal. By checking the number on this website, the contact details of the owner will then appear.
Hopefully, next time you encounter an injured bird, you’ll know exactly what to do!