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It is widely believed that common marmosets (Callithrx jacchus) typically give birth to twins under natural conditions. In captivity, however, births of triplets or even larger litters are common, although parents rarely succeed in rearing more than two offspring. The traditional interpretation is that captive conditions, notably the ready availability of(More)
Studies have shown that after controlling for the effects of body size on brain size, the brains of adult humans, rhesus monkeys, and chimpanzees differ in relative size, where males have a greater volume of cerebral tissue than females. We assess whether head circumference sexual dimorphism is present during early development by evaluating sex differences(More)
This study examines reproductive efficiency in the common marmoset monkey, Callithrix jacchus, using sequential ultrasound examinations to establish ovulation number, implantation rate, and incidence of prenatal loss. Ultrasound was carried out with a 10 or 7.5 mHz probe in nonsedated animals, daily during the late follicular phase, approximately twice a(More)
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