OswinOswald
Senior Member
TIL that to make bird's nest soup, the nests of swifts are harvested, who use their saliva to build the nests. Among the types of nests, one kind which is the most rare is apparently the red or pink nests. One theory is that when the birds have to keep producing more saliva they start to bleed a little which mixes into the saliva
Another theory was related to a type of lotus seed in the diet of the bird, but the first theory was more interesting
Another theory was related to a type of lotus seed in the diet of the bird, but the first theory was more interesting