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17. x\. llashlight photograph of the rock wall in the Niah Cave, Sarawak, showing Cave 

 Swiftlets on their nests. The birds find their way about in the complete darkness of the 

 caves by echo-location. (Page 193) 



18. Cave Swiftlet nests in the Niah Cave. The nests are made from the birds' saliva, and are 

 the raw material of birds'-nest soup. The nest in the centre contains a young Swiftlet, 

 that on the left an egg, and an adult perches on that on the right. (Page 193) 



