Most species of baleen whales (suborder Mysticeti) have been severely depleted. Their current status is due largely to commercial whaling, which took place during the 19th and early 20th centuries. Of the 11 species, nine currently have population estimates far below pre-whaling numbers. Recent population estimates for the blue and right whales total a small fraction of their numbers just over 100 years ago. The five most endangered whales can be found here: http://www.independent.co.uk/environment/nature/the-five-most-endangered-whales-935150.html
Whale species that are listed as endangered under the Endangered Species Act and IUCN World Conservation Databook include right, bowhead, blue fin, sei, humpback, sperm, vaquita, baijia nd Indus susu whale. Whale species with unknown or unlisted status include Ganges susu, boto, franciscana, tucuxi, Hecotr’s dophin, Indo-pacific and Atlantic humpbacked dolphin. This includes species of both baleen and toothed whale. Some whale species, such as California gray whales, have recovered enough to be removed from the ESA list. Killer whales are not on the list but are part of conservation programs.
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