A nostril (or naris, pl. nares) is one of the two channels of the nose,
Physiologically speaking, a human has two noses (making necessary two nostrils
that work in concert to provide constant humidification,from the point where they bifurcate to the external opening.
In birds
and mammals,
they contain branched bones or cartilages called turbinates, whose function is to warm air on inhalation and remove moisture on exhalation.
Fish do not breathe through their noses, but they do have two small holes used for smelling which may be called nostrils.
Physiologically speaking, a human has two noses (making necessary two nostrils
 |
| nose left nostril | right nostril |
that work in concert to provide constant humidification,from the point where they bifurcate to the external opening.
In birds
and mammals,
they contain branched bones or cartilages called turbinates, whose function is to warm air on inhalation and remove moisture on exhalation.
Fish do not breathe through their noses, but they do have two small holes used for smelling which may be called nostrils.
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