A price in human lives Because swiftlets build their nests on rock faces hundreds of feet from the ground, harvesting them is extraordinarily difficult work.
採燕人如何從絕壁上取得燕窩，從此才較為人知。以生命換取燕窩由於金絲燕在離地面上百公尺的岩壁上築巢，採燕可說是極高難度的工作。