Family Physeteridae (sperm whales) 3 species in 2 genera. Some neck vertebrae fused; head disproportionately large, with bulbous, squared snout; mouth narrow and ventral; lower teeth total 40–52 in Physeter, 16–32 in Kogia; upper teeth vestigial, smaller, varying in number. Blowhole a single asymmetrical opening on…
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