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Ontogeny and sexual dimorphism of the air sac in reindeer. (a) Male neonate, does not yet have an air sac but a small rostral depression, probably a homologue of the median laryngeal recess (see inset upper left); (b) subadult male, small air sac; (c) adult male, large air sac; (d) old adult female, small air sac. Scale bars: 10 mm.
