XEM CÁCH CHIM YẾN LÀM TỔ

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John
English
College Students
Humorous
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Summary
Cave swiftlets adapt to their dark environment by using saliva to build nests on cave walls. These nests, made from their spit, take about two months to complete and are crucial for breeding, providing safety from predators. They are also highly valued as gourmet delicacies in bird's nest soup.
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