Professor Kong Yun-cheung relates that he saw swiftlets 'nests in Zao-qing in Guangdong, and suggested to local officials that they should carefully protect them, and even wrote an article about it in a mainland publication.
江潤祥教授表示，他曾在廣東肇慶見過燕洞，還對當地提出應該好好保護的建議，並在大陸「動物學報」上為文發表。