What is this white animal? …Is it a dog? And this black one may be a pig?
a dog a pig
Is this white bird a parakeet? The black one would be a chicken. a chicken
a parakeet
 …Oh I see. This probably means that you cannot eat the white ones. It should be good to eat a chicken but bad to eat a parakeet.*
N.B These epitomes of good and evil may differ from yours. In this case, please regard them as mere examples, and so forth.