Should I of buried the bird or what?

Im sorry to hear about the sparrow, i love them too. Its ok to be cremated, don't listen to those negative people in your other question. You know if you buried it it would finally turn to dust anyway and get eaten by creatures. When they cremate it it just speeds up the process and then they sprinkle the ashes in a nice field. Don't feel bad you did a nice thing. :)