Ethically you have two options:

1. Notify the local Police about it and express your interest in owning it if the owner can't be found.

2. Start knocking on nearbyu doors and at nearby businesses to see if anyone knows who the owner is. If #2 leads to nobody then go to option one.

Ethically it isn't a puppy or kitten or pony so you can't play the "saving it" option.