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If a female guinea pig is introduced to multiple male guinea pigs, the males will fight and potentially kill one another in order to win the female.

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According to the textbook, Principles of Applications of Domestic Animal Behavior, females determine sexual action based on their receptivity of courtship behavior, advertisement of sexual receptivity, and hormone release. Guinea pigs exhibit all of the above, as mentioned in other sections.

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Young female guinea pigs and females in estrous show they are ready to be bred by arching their backs and raising their hind end.

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Guinea pigs mount like most mammals when copulating. Female guinea pigs are only receptive for 12-15 hours during estrous.

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This image is another example of guinea pigs exhibiting courtship behavior.

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This image shows just how promiscuous guinea pigs can be. When free, the male guinea pig is extremely polygamous. This is just reiterated by this male guinea pig who escaped and impregnated 400 females.

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In this video, the level of promiscuity is shown in guinea pigs. They consistently mate with various partners within the same group, whether male or female.

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The guinea pig (Cavia porcellus), also called the cavy or domestic guinea pig, is a species of rodent belonging to the family Caviidae and the genus Cavia. Despite their common name, these animals are not in the pig family, nor are they from Guinea.

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In this video, a male guinea pig courts a female guinea pig by squeaking loudly and attempting to mount her. As she leaves him, he continues to follow her in order to be able to mount her.

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Guinea Pigs Mating Dance, Squeaking Loudly, Attacking, Fighting, Playing

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Meeting with two cute guinea pigs - male and female, playing together, eating, matting dance, male attacking female, fighting guinea pig vs guinea pig. These animals on the video is as pet, live separately, but for matting these pets together in one cage. Please click "Like" and subscribe to this channel.

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Dimensions of Guinea Pig Social Personalities 

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Dimensions of Guinea Pig Social Personalities 

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In this study,  guinea pigs were reared with different groups of male to female conspecifics. It was found that sexual and courtship behavior are not associated with the dominance of the guinea pig. However, they tend to stay near guinea pigs of the same sex based on the level of sex drive. The conclusion made was that the tendency towards courting is an intrinsic trait.
http://eds.a.ebscohost.com.libproxy.lib.ilstu.edu/eds/pdfviewer/pdfviewer?vid=12&sid=f989585b-9891-4d53-9bf3-47760bd3cb6e%40sessionmgr4006&hid=4111

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The Milner Library proxy server will allow authorized individuals to use the indexes and databases when connecting through a computer off-campus.

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Female Choice in Promiscuous Wild Guinea Pigs

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Female Choice in Promiscuous Wild Guinea Pigs

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In this journal, a research study was done on yellow-toothed cavies. In the experiment, male and female guinea pigs were separated. The males had access to the females, but not to one another. The final results were that females were willing to mate with more than one male and males desired to mate with several females. In conclusion, both male and female guinea pigs are polygamous.
http://eds.b.ebscohost.com.libproxy.lib.ilstu.edu/eds/pdfviewer/pdfviewer?sid=70c41fa4-d1d9-49dd-8e47-fc9d7f383fb8%40sessionmgr102&vid=3&hid=104

# data[].attributes.attachment_link.description
The Milner Library proxy server will allow authorized individuals to use the indexes and databases when connecting through a computer off-campus.