Hello, I'm really ashamed about this situation but I guessed it was better to come here and ask for advice. This morning, one of my mom's friends brought me a wild sparrow that they caught from the wild. He caught it with the intention of gifting it to me since they know I own budgies, which makes no sense but he left the sparrow here anyway. It is, of course, alone in a cage, separated from my budgies.
I don't know a thing about sparrows and since it's caught from the wild, my first idea was to release it immediately. Some members of my family adviced me not to since the bird looks young, probably "lost its family" and would die out there which I honestly don't buy, but again, I don't know a thing about sparrows. Not even enough to know the age or gender.
What should I do? I still feel releasing it would be the best idea, but I rather ask here first. It has been with me for just one hour.
For some context, I live in the South of Mexico, in a city, sparrows are somewhat common around here. It's not as if you will see one every day, but sometimes you can hear some in the morning. My mom's friend caught it when it was around him in a fruit market (a fruit market that is close to my house). Supposedly, the sparrow was alone and couldn't fly high enough, so it was easy to catch it. I haven't tried to touch it or anything, but just by mere observation, I don't notice any injury of any kind. Here are some pictures:
Please help, thank you.