Greig I, Morris K, Mathiesen E, Mathiesen R & Buchanan-Smith HM (2006) An Improved Marmoset Restraint Device for Injections and the Collection of Samples. Laboratory Primate Newsletter, 45 (2), pp. 1-5. http://www.brown.edu/Research/Primate/lpn45-2.pdf
First paragraph: Although involuntary physical restraint of a primate causes stress if the animal is not fully habituated, it is often used to achieve experimental objectives, and sometimes to protect personnel. Considerations for the physical restraint of laboratory animals have been described by the Institute for Laboratory Animal Research (2003), and methods of restraint for the larger-bodied nonhuman primates housed in laboratories by Reinhardt et al. (1995). Considerations for restraint of the smaller bodied primates, such as marmosets (Callithrix spp.), have received less attention. Larger primates have been successfully trained, using positive reinforcement techniques, to cooperate with injections and blood sampling, and this is known to minimize the associated adverse effects (Reinhardt, 2003). However, because of their small size, and the precision needed, marmosets can probably not be trained using positive reinforcement techniques to present a limb for blood sampling and for injections. Therefore, methods of restraint are needed.
Laboratory Primate Newsletter: Volume 45, Issue 2