The general concept says that birds are almost devoid of olfaction. Anyway, our weak noses would make them shame. But recent researches have showed it's not like that. New World vultures and condors have a smell that would compete with that of the dogs. Experiments made on newly-hatched chickens showed that the little birds could smell water containing a bitter chemical, even ignoring color clues. It seems that birds rather smell a toxic insect than are aware of its warning colors.
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