燕窝是金丝燕在岩石间筑成的巢，北方人常称之为燕莱。金丝燕属于雨燕科，是一种终年生活在热带海域的留鸟。这种鸟的筑巢方式比较特殊，它通过舌食海藻后，经胃液酝酿复吐出来的胶状物来作窝，俗称燕之唾液。这种胶状唾液具有较强的粘附性和极强的凝固性，金丝燕把它吐出来时 Swallow's nest is a swallow nest built in the rock, northerners often called Yan Lai. Swift belongs to the Swallow family, is a year-long stay in the tropical waters of the remaining birds. The nesting of this bird is rather special. After it passes through the seaweed, it rebuilds the jelly by rejuvenating the gastric juice. It is commonly known as the saliva of Yan. This jelly saliva has strong adhesion and strong coagulation, swiftlet put it out