(no subject)
Jul. 24th, 2007 03:43 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
vriad_leeWhen ducks pair off with mating partners, often one or several drakes will end up "left out". This group will sometimes target an isolated female duck — chasing, pestering and pecking at her until she weakens (a phenomenon referred to by researchers as rape flight), at which point each male will take turns copulating with the female. Male Mallards will also occasionally chase other males in the same way. (In one documented case, a male Mallard copulated with another male he was chasing after it had been killed when it flew into a glass window. ( http://en.wikipedia.org/wiki/Mallard )
Male penguin couples have been documented to mate for life, build nests together, and to use a stone as a surrogate egg in nesting and brooding. In 2004, the Central Park Zoo in the United States replaced one male couple's stone with a fertilized egg, which the couple then raised as their own offspring.
Some black swans of Australia form sexually active male-male mated pairs and steal nests, or form temporary threesomes with females to obtain eggs, driving away the female after she lays the eggs. More of their cygnets survive to adulthood than those of different-sex pairs possibly due to their superior ability to defend large portions of land.
Male lions often lead their social groups jointly with one or more of their brothers. To ensure loyalty, the male co-leaders will "strengthen the bonds by often having sex with each other."
Homosexual behaviour has been observed among 1,500 species, and in 500 of those it is well documented.
"To turn the approach on its head: No species has been found in which homosexual behaviour has not been shown to exist, with the exception of species that never have sex at all, such as sea urchins and aphis..."
A study by Platt, Khera and Deaner at Duke University North Carolina (reported in Current Biology and online here), showed that male monkeys will give up privileges (in this case, juice, which was highly valued), to be allowed to see a female monkey's hindquarters.
Deaner and his team reported that monkeys would take a juice cut to look at powerful males' faces or the perineum of a female, but to persuade the monkeys to stare at subordinate males, the researchers had to bribe them with larger drinks. "Virtually all [male] monkeys will give up juice to see female hindquarters ... they really value the images."
Problems with encouraging pandas to mate in captivity have been very common. However, showing young male pandas "panda pornography" is widely credited with a recent population boom among pandas in zoos.
In 2007, research suggested that in the Acilius genus of water beetles (also known as "diving beetles"), an "evolutionary arms race" between the genders means that there is no courtship system for these beetles. "Its a system of rape. But the females don't take things quietly. They evolve counter-weapons." Cited mating behaviors include males suffocating females underwater till exhausted, and allowing only occasional access to the surface to breathe for up to six hours (to prevent them breeding with other males), and females which have a variety of body shapings (to prevent males from gaining a grip). Foreplay is "limited to the female desperately trying to dislodge the male by swimming frantically around."
Charles Siebert reports in his New York Times article Elephant Crackup? that:
Since the early 1990’s, for example, young male elephants in Pilanesberg National Park and the Hluhluwe-Umfolozi Game Reserve in South Africa have been raping and killing rhinoceroses; this abnormal behavior, according to a 2001 study in the journal Pachyderm, has been reported in ‘‘a number of reserves’’ in the region. ( http://en.wikipedia.org/wiki/Rape_flight )
It has also been recorded that certain species of mole will 'rape' new borns of their own species, the advantage to this is that when those moles mature and become fertile, they will become pregnant with the sperm of the mole that had mated with them at a very young age. ( http://en.wikipedia.org/wiki/Sociobiological_theories_of_rape )
[...] Even in ancient Egypt, there is record of the treatment of the bodies of young women that were set out to rot for a few days before being delivered to embalmers. This practice was born from the need to discourage the men performing the funerary customs from having sexual interest in their charges. Herodotus writes in The Histories that, to discourage intercourse with a corpse, Ancient Egyptians left deceased beautiful women to decay for "three or four days" before giving them to the embalmers. ( http://en.wikipedia.org/wiki/Necrophilia )
Male penguin couples have been documented to mate for life, build nests together, and to use a stone as a surrogate egg in nesting and brooding. In 2004, the Central Park Zoo in the United States replaced one male couple's stone with a fertilized egg, which the couple then raised as their own offspring.
Some black swans of Australia form sexually active male-male mated pairs and steal nests, or form temporary threesomes with females to obtain eggs, driving away the female after she lays the eggs. More of their cygnets survive to adulthood than those of different-sex pairs possibly due to their superior ability to defend large portions of land.
Male lions often lead their social groups jointly with one or more of their brothers. To ensure loyalty, the male co-leaders will "strengthen the bonds by often having sex with each other."
Homosexual behaviour has been observed among 1,500 species, and in 500 of those it is well documented.
"To turn the approach on its head: No species has been found in which homosexual behaviour has not been shown to exist, with the exception of species that never have sex at all, such as sea urchins and aphis..."
A study by Platt, Khera and Deaner at Duke University North Carolina (reported in Current Biology and online here), showed that male monkeys will give up privileges (in this case, juice, which was highly valued), to be allowed to see a female monkey's hindquarters.
Deaner and his team reported that monkeys would take a juice cut to look at powerful males' faces or the perineum of a female, but to persuade the monkeys to stare at subordinate males, the researchers had to bribe them with larger drinks. "Virtually all [male] monkeys will give up juice to see female hindquarters ... they really value the images."
Problems with encouraging pandas to mate in captivity have been very common. However, showing young male pandas "panda pornography" is widely credited with a recent population boom among pandas in zoos.
In 2007, research suggested that in the Acilius genus of water beetles (also known as "diving beetles"), an "evolutionary arms race" between the genders means that there is no courtship system for these beetles. "Its a system of rape. But the females don't take things quietly. They evolve counter-weapons." Cited mating behaviors include males suffocating females underwater till exhausted, and allowing only occasional access to the surface to breathe for up to six hours (to prevent them breeding with other males), and females which have a variety of body shapings (to prevent males from gaining a grip). Foreplay is "limited to the female desperately trying to dislodge the male by swimming frantically around."
Charles Siebert reports in his New York Times article Elephant Crackup? that:
Since the early 1990’s, for example, young male elephants in Pilanesberg National Park and the Hluhluwe-Umfolozi Game Reserve in South Africa have been raping and killing rhinoceroses; this abnormal behavior, according to a 2001 study in the journal Pachyderm, has been reported in ‘‘a number of reserves’’ in the region. ( http://en.wikipedia.org/wiki/Rape_flight )
It has also been recorded that certain species of mole will 'rape' new borns of their own species, the advantage to this is that when those moles mature and become fertile, they will become pregnant with the sperm of the mole that had mated with them at a very young age. ( http://en.wikipedia.org/wiki/Sociobiological_theories_of_rape )
[...] Even in ancient Egypt, there is record of the treatment of the bodies of young women that were set out to rot for a few days before being delivered to embalmers. This practice was born from the need to discourage the men performing the funerary customs from having sexual interest in their charges. Herodotus writes in The Histories that, to discourage intercourse with a corpse, Ancient Egyptians left deceased beautiful women to decay for "three or four days" before giving them to the embalmers. ( http://en.wikipedia.org/wiki/Necrophilia )
(no subject)
Date: 2007-07-24 01:19 pm (UTC)(no subject)
Date: 2007-07-24 01:48 pm (UTC)(no subject)
Date: 2007-07-24 04:33 pm (UTC)(no subject)
Date: 2007-07-24 06:24 pm (UTC)(no subject)
Date: 2007-07-26 10:20 am (UTC)(no subject)
Date: 2007-07-26 12:44 pm (UTC)(no subject)
Date: 2007-07-27 06:57 am (UTC)But here's a bit more to add to your research...
http://www.nature.com/neuro/journal/v2/n11/full/nn1199_943.html
(A comment about those here (http://www.newyorker.com/reporting/2007/07/30/070730fa_fact_parker) made me just look them up.)
(no subject)
Date: 2007-07-27 12:22 pm (UTC)(no subject)
Date: 2007-08-20 02:20 am (UTC)http://www.chushka.com/gallery/photos/liverette1.jpg.html
(no subject)
Date: 2007-08-20 04:57 am (UTC)