Assertion: porpoise | /r/HasProperty | divided in to six species
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text: However there are three main differences between dolphins and porpoises, that is, porpoises are divided in to six species and sub species, while dolphins are divided into 40 different main types, the average dolphin is generally longer than the average porpoise, and the most obvious visible difference between the two groups is that porpoises have flattened, spade-shaped teeth.