Calculated at a rate of 1400 insects per gram, a 10-gram swiftlet must eat 7000 insects a day; over the course of a lifetime, the figure becomes astronomical. This is very beneficial for maintaining the ecological balance.
若以一公克昆蟲約有一千四百隻計算，一隻十公克的燕子，等於一天吃掉近七千隻蚊蟲，一生吃掉的數量，更是天文數字，對平衡生態起很大的作用。