then don't eat anymore ! .... 
and for bird's nest ... besides eating bird's saliva, have you seen
a real swallow's bird's nest, before it's harvested ? ... it's full
of feathers and green algae and bird shit and stuff ...
and because of demand some poachers would just tear off the nests
from clift walls and toss the baby swallows down ! ...
so don't feed that demand ! ...
