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THE COMMON MARMOSET
Callithrix jacchus

Observing Primate Behavior


Why we observe non-human primates

Similar to humans, marmosets have a wide range of behaviors. As non-human primates are our closet relatives and so similar to us, we can learn a lot from them. We can gain new knowledge about their behavior just by watching them. Some non-human primates can be great models for human activity because they live in families, just like humans. Non-human primates have always sparked our curiosity and imagination. Through observing primates we are given the chance to learn about ourselves and about behavior that is more typical of primates than other mammals.

Common questions

Some questions that are commonly asked in regards to observing marmosets that you might want to use are:

Group dynamics

Primates, including the common marmoset, can be found in a variety of different social groupings:

Common Marmosets live in groups or families of 3-20 animals. They eat, sleep, and travel together in the same group. Living together proves to have many benefits, such as: While there are benefits to group living, there are disadvantages, especially to the lower ranking members of the group. Reproduction in subordinate females is suppressed, as these females usually do not ovulate or mate. Reproduction in subordinate males is also suppressed, as these males usually do not mate with fertile females.  Subordinates appear to postpone their reproduction to a time more favorable for reproductive success.

Cooperative Breeding

For the most part common marmosets practice cooperative breeding, which is characterized by the participation in infant care or other activities by other members of the group besides the mother. They usually live in multi male & multi female groups that resemble an extended family. Cooperative breeders usually specialize in habitats in which the amount of energy it takes to raise infants is very high. Twins weigh, on average, 23% of their mother's body weight. The mother also gets pregnant again within 2-3 weeks of giving birth. Therefore, the mother is usually pregnant and lactating at the same time, both activities consume much of the mother's energy.

Marmoset Behavior

The common marmoset displays a fascinating range of behaviors, many of which you can observe on the Callicam.

Ethogram

An ethogram (a graph or chart of behavior) is used to compare certain behaviors that can be observed while watching the marmosets.

Observation Exercises


Text and design by Lissa Pabst.

Development of this web page was supported by a grant from the Wisconsin Advanced Telecommunications Foundation, the University of Wisconsin (Extension & Systems), and grants number RR00167 and number RR15311, National Primate Centers Program, National Center for Research Resources, National Institutes of Health.

URL: http://www.primate.wisc.edu/pin/marmoset/observing.html
Page last modified: July 29, 2003
Maintained by the WPRC Library

Send questions, comments, and suggestions about this site to Larry Jacobsen

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