Dolphins are clever and sociable, but they also have a dark side that will make your hair stand on end. Dolphins are intelligent, friendly mammals that like to play tricks. All of the above is true, but dolphins also go in for sexual harassment, incest and infanticide. View image of Dolphins! For the doubters amongst you, there is an extraordinary number of studies exploring their cognition.
Most of them focus on the most common and well-known kind of dolphin: In a classic study published inresearchers trained a female bottlenose dolphin called Akeakamai to mimic sounds generated by a computer. The electronic sounds, and Akeakamai's responses, are remarkably similar.
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Then the biologists began to link these sounds to objects like a hoop, pipe, Frisbee or ball. Akeakamai was quick to figure out the connection and make the vocalization appropriate to each object.
In essence, she had learned a new vocabulary. Wild dolphins achieve similar feats. Each dolphin has its own signature whistle, which acts like a name. View image of Bottlenose dolphins are clever, and a bit nasty Credit: When researchers produce synthetic versions of these calls, the dolphins respond to playbacks as if they know who is calling. They also remember each other. A study revealed that captive dolphins can remember the whistles for many years, sometimes decades.
In one case, a female called Allie at Brookfield Zoo clearly responded to playbacks of Bermuda-based Bailey, even though they had not seen each other for over 20 years.
Even more impressingly, in two bottlenose dolphins at the New York Aquarium passed the "mirror test". After researchers drew patterns and shapes on the animals' skin using "a non-toxic temporary black ink Entre marker", the dolphins quickly swam over to a mirror and spent long periods studying themselves.
This suggests they can recognise themselves, at least to some degree, something only a handful of species can do. All this brainy brilliance "Dolphin chahi pakistan sexual harassment" have contributed to the rise of dolphin worship within the New Age movement and beyond. But studies have also revealed another, darker side
Dolphin chahi pakistan sexual harassment dolphins. They do not just behave like Flipper. Accessibility links
View image of A bottlenose dolphin Tursiops truncatus Credit: When it comes to the breeding
Dolphin chahi pakistan sexual harassment, there is fierce competition over females. In the s, Connor and his colleagues were the first to document male bottlenose dolphins aggressively "herding" fertile females in Australia's Shark Bay.
The females frequently "bolted", but only managed to escape the males once in every four attempts. The males do this by rushing at her. With further observationsit became clear that these
Dolphin chahi pakistan sexual harassment between males were incredibly fluid.
Small teams of males were usually part of larger "super-alliances" of up to 14 males. It is also clear that the females are not particularly willing participants.
The female's determined efforts to escape these controlling males may result from another sinister truth about dolphins. View image of A mother dolphin with her calf Credit: During and37 young bottlenose dolphins washed up on beaches in Virginia.
Superficially, there appeared to be nothing wrong with them, but necropsy revealed evidence of "severe blunt-force trauma".
The injuries were mainly to the head and chest, "and multiple rib fractures, lung lacerations, and soft tissue contusions were prominent," according to a study published in There was lots of evidence that adult dolphins were responsible for the deaths. In particular, one of the researchers saw "several behavioral events benignly dubbed 'calf tossing' in the near shore waters of Virginia Beach". Calf tossing sounds like a fun game, but it could also be a way for adult males to bash unrelated baby dolphins to death, so that their mothers will come back into oestrus.
Inresearchers saw male dolphins attack a newborn calfalthough in this case the calf seems to have escaped. View image of A dead calf being thrown through the air Credit: If infanticide is indeed a real and present danger in
Dolphin chahi pakistan sexual harassment society, a female would do well to mate with lots of different males from different alliances, says Connor. That way, the males would not know if they were the father of her calf and would be less likely to kill it.
There is one more surprise lurking in dolphins' mating behaviour.
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A paternity analysis of the Shark Bay population revealed that they occasionally practice incest. One male, known as BJA, become a father in — only to reproduce with his own daughter in15 years later. In line with this, a study published in confirmed that the rate of inbreeding in this population is higher than expected by chance alone. And you thought sharks were disturbing? By Henry Nicholls 5 February Dolphin. Who's band was The Quarrymen.
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Harris, A.J.L.; Carn, S.A.; Dehn, J.; Del Negro, C.; Gudmundsson,
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