I don't think so, in Singapore there are buildings/flats are everywhere. Once the bird take fight, it may not know how to come back. I used to own a lovebird that flew out and didn't manage to come back, I only manage to get her back 3 days later when I heard her chirpping on a tree below my block. She must be confused and doesn't know which unit I'm in as there are too many flats around! Unlike many many years ago, my grand uncle used to own many cockatoos and greys and he did not even chain a single of them! They are all tame from wild and would fly in and out of his place as and when they want. Its just so cool, thou I was around 5 or 6 yrs old, I can still remember everything clearly. After a few years later, most of his birds didn't come back after HDB flat starts to built around his area.