Overeager whalers aren't the only problem whales face, but since their three-century assault reduced many whale populations by 90 percent or more, they have certainly made a lasting impression. Today's shrunken remnants are less able to endure other hardships now that their numbers are so low, both because there are fewer whales left to lose and because those whales have less genetic diversity than their ancestors. So when something unexpected like an oil spill or unusual like ocean acidification raises pressure on these remaining whales, the population and even species as a whole is more likely to feel the repercussions. The vastness of the ocean and the wanderlust of whales prevent biologists from getting a clear idea of how many exist, but they can guess well enough to at least know the following 10 whales are in dire straits. This list isn't comprehensive, but the five baleen and five toothed whales include many of the most endangered alive today. Also known as "great whals," these huge marine mammals include some of the largest animals that have ever lived — which makes it that much stranger that they eat plankton, tiny sea creatures often invisible to the naked eye.
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What is an estimate of the population of whales?
Sperm Whales - The World’s Best Places for Whale Watching and Swimming | Diviac Magazine
Marine Mammals. Open Waters. Largest of the toothed whales, sperm whales are unique and easy to identify. They have unusually large heads one-third their body length ; narrow, almost hidden lower jaws and off-center blows.
Sperm Whales - The World’s Best Places for Whale Watching and Swimming
It is the only living member of the genus Physeter and one of three extant species in the sperm whale family , along with the pygmy sperm whale and dwarf sperm whale of the genus Kogia. The sperm whale is a pelagic mammal with a worldwide range, and will migrate seasonally for feeding and breeding. The females cooperate to protect and nurse their young.