Apr 5, 2021 Today I Learned: Swiftlet nests are made from strands of saliva from the male swiftlet bird. Swiftlet nests collected from Thai caves can fetch more than $900 per pound. It is one of the world’s most coveted and expensive food items. For your chance to win, click the Kost Tire & Auto logo above and enter Swiftlet nests as the answer. You could win a $50 Kost Tire & Auto gift card and be entered to win a $400 Kost Tire gift card at the end of the month.