How swiftlet go into the bird house 燕子如何进入鸟屋

1) Top Roof 开顶

2) 2nd Floor Entry Hole 三楼进鸟洞

3) 2nd Floor Rooving Room 三楼漫游区


4) 2nd Floor Flying Path 三楼飞行道


5) Nesting Room 造窝区

6) To 1st Floor Entry Hole 二楼进鸟洞

7) 1st Floor Rooving Room 二楼漫游区

8) 1st Floor Nesting Room (Front) 造窝区（前）

8b) 1st Floor Nesting Room (Back) 造窝区（后）