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* Large fat body extends cranially into the abdominal cavity from the cranial pole of each testis.
 
* Large fat body extends cranially into the abdominal cavity from the cranial pole of each testis.
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== Accessory Sex Glands==
 
== Accessory Sex Glands==
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* '''Bulbourethral glands''' are dorsolateral to '''ischiocavernosus muscles'''.
 
* '''Bulbourethral glands''' are dorsolateral to '''ischiocavernosus muscles'''.
 
** Isciocavernosus muscles are enormous, swelling on either side of the rectum and meeting over its top.
 
** Isciocavernosus muscles are enormous, swelling on either side of the rectum and meeting over its top.
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== Penis ==
 
== Penis ==
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** The small supporting bone is known as the '''baculum'''.
 
** The small supporting bone is known as the '''baculum'''.
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== Copulation ==
 
== Copulation ==
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* Breeds all year round.
 
* Breeds all year round.
 
* '''Copulatory plug''' at mating.
 
* '''Copulatory plug''' at mating.
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= FEMALE =
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== Reproductive Tract ==
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* [[Female_Reproductive_Tract_-The_Ovary_-_Anatomy_%26_Physiology|Ovaries]] are just caudolateral to the [[Kidney_-_Comparative_Anatomy_%26_Physiology|kidneys]].
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* [[Female_Reproductive_Tract_-The_Uterus_-_Anatomy_%26_Physiology#Anatomical_Types_of_Uteri|Bicornuate duplex uterus]].
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* [[Female_Reproductive_Tract_-The_Uterus_-_Anatomy_%26_Physiology|Uterine lumena]] do not fuse. 
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** The two uterine horns continue into seperate [[Female_Reproductive_Tract_-The_Cervix_-_Anatomy_%26_Physiology|cervices]]
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** Open separately into a single [[Female_Reproductive_Tract_-The_Vagina/Vestibule_-_Anatomy_%26_Physiology|vagina]].
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* Membrane covers [[Female_Reproductive_Tract_-The_Vagina/Vestibule_-_Anatomy_%26_Physiology|vaginal]] opening except at oestrus and during [[Reproductive_System#Parturition|parturition]].
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== Puberty and Sexual Maturity ==
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* '''Puberty''' at ~8 months
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** Puberty can be same year as birth, but if the chinchilla is born late in the year it will not reach puberty until the next breading season.
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== Oestrous Cyclicity ==
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* In the Northern Hemisphere the breeding season is November-May.
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* Seasonally polyoestrus with a mean cycle of ~40 days.
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* Post-partum oestrus.
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** Often two litters per year, three are possible.
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* Breeding life is ~10 years.
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== Gestation and Offspring==
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* Long [[Reproductive_System#Gestation|gestation]] period: 111 days
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* Litter size 1-6
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* Precocious offspring
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** Weaning age is 6 weeks.
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== Mammary Gland ==
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* Three pairs
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** One inguinal pair
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** Two lateral thoracic
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* Teats protrude sideways, allowing the young to sit beside the dam and suckle.
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