Assertion: cetacean | /r/HasProperty | thriving before 16th century
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text: In fact before the whaling era of the 17th – 20th centuries whales were largely abundant throughout all of the worlds major oceans and most of the well known species of cetacea (cetaceans include all species of whale, dolphin and porpoise) appeared to be thriving (or at least fairly abundant) before the 16th century, however during the course of the whaling era many species of whale (especially baleen whales) were being hunted for their blubber which was used to create various products such as transmission oil, margarine, cooking chemicals and soap.