Those bird people normal seen perching on electrical wire , building window and edge is not swiftlets!

所以,人们一般看到停留在电线杆, 建筑物窗沿或屋檐的都并非金丝燕!

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Since the building a better habitat for swiftlets, house nests are much cleaner with less impurity.

金丝燕巢一般都筑在洞穴高深处且环境杂乱.

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Different colour is due to the food that the swiftlets eat and environment.

不同的燕窝颜色是金丝燕的食物和筑巢环境所造成的.

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