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Skulls from 214 Eastern Pacific harbour seals (Phoca vitulina richardii) were examined macroscopically according to predefined criteria. The museum specimens were acquired from strandings along the west coast of the USA between 1909 and 2014. Ninety-eight skulls (45.8%) were from male animals, 108 (50.5%) from female animals and eight (3.7%) from animals of unknown sex. Their age varied from neonate...
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