What kind of bird is this? Open the cage at night and fly back?

See the answer, this is the "ten sisters" bird, also known as the white-waisted wenbird. Mild personality, strong adaptability to the environment, easy to raise. It has low feed requirements, high reproductive capacity and stable hatching performance, and is often used to breed nanny birds of other wenbirds. Ten sisters are pet birds raised under artificial breeding conditions. Compared with wild birds, they have lost their homing ability. Generally speaking, most of the ten sisters released will not fly back. You should be prepared for this. Family statement, for reference only.