Caretaker Tan Jin Hong looks for swifts on the roof of the Swiftlet Eco Park in Perak, northern Malaysia, Feb. 14, 2015. Prized in China for is alleged health benefits for hundreds of years, nests made from swiftlets’ saliva are being mixed into coffee and cereal as the Southeast Asian producers of the delicacy seek to broaden its appeal, and their profit margins. The nests are among the world’s most expensive foods, selling for up to $2,500 a kg and the swiftlets that weave them are indigenous to Indonesia, Malaysia, Thailand and Vietnam. (Reuters Photo/Olivia Harris)

Speakers are pictured on a roof at the Swiftlet Eco Park in Perak, northern Malaysia, Feb. 14, 2015. (Reuters Photo/Olivia Harris)

Caretaker Tan Jin Hong holds a swiftlet tester which plays bird songs to attract swifts at the Swiftlet Eco Park in Perak, northern Malaysia, Feb. 14, 2015. (Reuters Photo/Olivia Harris)

Swifts fly inside a building constructed to farm swiftlet nests at the Swiftlet Eco Park in Perak, northern Malaysia, Feb. 14, 2015. (Reuters Photo/Olivia Harris)

Caretaker Tan Jin Hong harvests a bird’s nest at the Swiftlet Eco Park in Perak, northern Malaysia, Feb. 14, 2015. (Reuters Photo/Olivia Harris)

Caretaker Tan Jin Hong looks for swifts on the roof of the Swiftlet Eco Park in Perak, northern Malaysia, Feb. 14, 2015. Prized in China for is alleged health benefits for hundreds of years, nests made from swiftlets’ saliva are being mixed into coffee and cereal as the Southeast Asian producers of the delicacy seek to broaden its appeal, and their profit margins. The nests are among the world’s most expensive foods, selling for up to $2,500 a kg and the swiftlets that weave them are indigenous to Indonesia, Malaysia, Thailand and Vietnam. (Reuters Photo/Olivia Harris)

Caretaker Tan Jin Hong looks for swifts on the roof of the Swiftlet Eco Park in Perak, northern Malaysia, Feb. 14, 2015. Prized in China for is alleged health benefits for hundreds of years, nests made from swiftlets’ saliva are being mixed into coffee and cereal as the Southeast Asian producers of the delicacy seek to broaden its appeal, and their profit margins. The nests are among the world’s most expensive foods, selling for up to $2,500 a kg and the swiftlets that weave them are indigenous to Indonesia, Malaysia, Thailand and Vietnam. (Reuters Photo/Olivia Harris)

Caretaker Tan Jin Hong poses with a bird’s nest and egg at the Swiftlet Eco Park in Perak, northern Malaysia, Feb. 14, 2015. (Reuters Photo/Olivia Harris)

A worker poses with an unclean bird’s nest at a processing plant in Kuala Lumpur, Feb. 17, 2015. (Reuters Photo/Olivia Harris)

Two styles of cleaned bird’s nest, Yan Zhan (L) and Su Zhan (R) await repacking at a processing plant in Kuala Lumpur, Feb. 17, 2015. (Reuters Photo/Olivia Harris)

Bird’s nests are pictured before the cleaning process at a processing plant in Kuala Lumpur, Feb. 17, 2015. (Reuters Photo/Olivia Harris)

Clean bird’s nests are sorted according to size at a processing plant in Kuala Lumpur, Feb. 17, 2015. (Reuters Photo/Olivia Harris)

A worker uses tweezers to remove feathers from a bird’s nest at a processing plant in Kuala Lumpur, Feb. 17, 2015. (Reuters Photo/Olivia Harris)

A worker uses tweezers to remove feathers from a bird’s nest at a processing plant in Kuala Lumpur, Feb. 17, 2015. (Reuters Photo/Olivia Harris)

Bird’s nest coffee is pictured for sale at an outlet at Kuala Lumpur International Airport 2, outside Kuala Lumpur, Feb. 18, 2015. (Reuters Photo/Olivia Harris)