World wide sperm whale population graph

Scientists didn't even know they existed until , but now their already-small population may be dropping as much as 15 percent each year. Because dolphins are much smaller than whales they were much less likely to be hunted and attacked during the whaling era as they provided much less oil from their blubber than the larger whale species, however they were and still are hunted for other reasons. Pygmy sperm whale Kogia breviceps de Blainville Journal of the Acoustical Society of America 1: On windless days, such an angled blow is diagnostic. An estimated 12, southern right whales are spread throughout the southern hemisphere, compared to an original population before whaling of more than , Articles from Proceedings of the Royal Society B:
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Sperm Whales

We also sought to discover which genes showed signs of positive selection shared with other cetaceans or unique to sperm whale. Abundance and seasonal residence of sperm whales at Kaikoura, New Zealand. Sperm whales Physeter macrocephalus are the largest of the odontocetes toothed whales and the most sexually dimorphic cetaceans, with males considerably larger than females. Where, how many, how big? Citing articles via Web of Science 1.
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Sperm Whale Species Guide - Whale and Dolphin Conservation

Lack of records of live animals may be due to the inconspicuous behaviour of Dwarf Sperm Whales, rather than rarity Carwardine ; Jefferson et al. There is little information on mortality and pathology for Dwarf Sperm Whales. Furthermore, recovery might be inhibited via temporary or permanent loss of social cohesion and of socio-ecological knowledge such as is known to occur in other large-brained, long-lived social mammals e. Sperm whales are predominantly black to brownish grey, with white areas around the mouth and often on the belly. Many environmental groups and governments are involved in creating a safer environment for these huge mammals, including efforts to ensure migration routes are clear of obstacles such as large fishing nets. Whalers took sperm whales for this oil for centuries — some believe that sperm whale size has decreased due to over-hunting, while others believe it has risen due to less competition for food resources after the population was culled by humans. Predation is assumed to be high, as the closely related Pygmy Sperm Whale has anatomical adaptations to avoid predators.
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Males migrate to higher latitudes, alone or in groups, and head back towards the equator to breed. Apple's new iPhone X is a glimpse into the future. Journal of the Acoustical Society of America. Typically, however, it is believed that most killer whale attacks are unsuccessful. Impact of whale watching on sperm whales at Kaikoura. Incredible footage takes you inside the mouth of the The Sperm Whale has a large geographic range Rice
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