Laboratory Primate Newsletter

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Laboratory Primate Newsletter LABORATORY PRIMATE NEWSLETTER Vol. 44, No. 1 January 2005 JUDITH E. SCHRIER, EDITOR JAMES S. HARPER, GORDON J. HANKINSON AND LARRY HULSEBOS, ASSOCIATE EDITORS MORRIS L. POVAR, CONSULTING EDITOR ELVA MATHIESEN, ASSISTANT EDITOR ALLAN M. SCHRIER, FOUNDING EDITOR, 1962-1987 Published Quarterly by the Schrier Research Laboratory Psychology Department, Brown University Providence, Rhode Island ISSN 0023-6861 POLICY STATEMENT The Laboratory Primate Newsletter provides a central source of information about nonhuman primates and re- lated matters to scientists who use these animals in their research and those whose work supports such research. The Newsletter (1) provides information on care and breeding of nonhuman primates for laboratory research, (2) dis- seminates general information and news about the world of primate research (such as announcements of meetings, research projects, sources of information, nomenclature changes), (3) helps meet the special research needs of indi- vidual investigators by publishing requests for research material or for information related to specific research prob- lems, and (4) serves the cause of conservation of nonhuman primates by publishing information on that topic. As a rule, research articles or summaries accepted for the Newsletter have some practical implications or provide general information likely to be of interest to investigators in a variety of areas of primate research. However, special con- sideration will be given to articles containing data on primates not conveniently publishable elsewhere. General descriptions of current research projects on primates will also be welcome. The Newsletter appears quarterly and is intended primarily for persons doing research with nonhuman primates. Back issues may be purchased for $5.00 each. We are no longer printing paper issues, except those we will send to subscribers who have paid in advance. We will not accept future subscriptions, unless subscribers are willing to pay $60/year within the U.S.; $80/year outside the U.S. (Please make checks payable to Brown University.) Readers with access to electronic mail may receive the nongraphic contents of each issue by sending the message subscribe LPN-L your-own-name to [email protected] (Send the message subscribe LPN-PEF to receive PDF files by e-mail; or the message subscribe LPN-WARN to receive a notice when a new issue is put on the Website.) Current and back issues of the Newsletter are available on the World Wide Web at <http://www.brown.edu/primate>. Persons who have absolutely no access to the Web, or to the electronic mail- ing, may ask to have paper copies sent to them. The publication lag is typically no longer than the three months between issues and can be as short as a few weeks. The deadline for inclusion of a note or article in any given issue of the Newsletter has in practice been some- what flexible, but is technically the tenth of December, March, June, or September, depending on which issue is scheduled to appear next. Reprints will not be supplied under any circumstances, but authors may reproduce their own articles in any quantity. PREPARATION OF ARTICLES FOR THE NEWSLETTER. – Articles, notes, and announcements may be submitted by mail, e-mail, or computer disk, but a printed copy of manuscripts of any length or complexity should also be sent by regular mail. Articles in the References section should be referred to in the text by author(s) and date of publication, e.g., Smith (1960) or (Smith & Jones, 1962). Names of journals should be spelled out com- pletely in the References section. Technical names of monkeys should be indicated at least once in each note and article. In general, to avoid inconsistencies within the Newsletter, the scientific names used will be those in Mam- mal Species of The World: A Taxonomic and Geographic Reference, 2nd Ed. D. E. Wilson & D. M. Reeder (Eds.). Washington, DC: Smithsonian Institution Press, 1993. For an introduction to and review of primate nomenclature see the chapter by Maryeva Terry in A. M. Schrier (Ed.), Behavioral Primatology: Advances in Research and The- ory (Vol. 1). Hillsdale, NJ: Lawrence Erlbaum Associates, 1977. All correspondence concerning the Newsletter should be addressed to: Judith E. Schrier, Psychology Department, Box 1853, Brown University Providence, Rhode Island 02912 [401-863-2511; FAX: 401-863-1300] e-mail address: [email protected] Current and back issues of the Newsletter are available on the World Wide Web at http://www.brown.edu/primate ACKNOWLEDGMENTS The Newsletter is supported by U. S. Public Health Service Grant RR-00419 from the Comparative Medicine Program, National Center for Research Resources, N.I.H. Cover illustration of Hylobates lar by Anne Richardson, in memory of Beanie. Copyright © 2005 by Brown University Puzzle-Ball Foraging by Laboratory Monkeys Improves with Experience Crystal R. Lloyd, Grace H. Lee, and Carolyn M. Crockett National Primate Research Center, University of Washington Nonhuman primates in the wild typically spend con- (Crockett et al., 2001), modified from a design by Mur- siderable time foraging for food. The time needed to find, chison (1992). The first batch of Puzzle Balls was in- obtain, and process food can take between 30% and 70% stalled in 1998, and we have added to the inventory over of a monkey’s day (Boinski, 1988; Sussman & Tattersall, the years. By December 2004, Puzzle Balls had been 1981). In captivity, far less time is required owing to the installed on nearly every cage at the Washington National ease of obtaining provisioned food (Boccia & Hijazi, Primate Research Center (WaNPRC) in Seattle. 1998; Crockett et al., 1995). During the idle time that wild monkeys would typically spend foraging, some cap- tive monkeys develop and display abnormal behaviors. Logically, it would seem that providing foraging activities would reduce time spent on abnormal behaviors. Some studies have found reductions in abnormal be- havior of caged monkeys associated with the presence of foraging devices (Bayne et al., 1991; Brent & Long, 1995; Crockett et al., 2001), but not all (Lutz & Farrow, 1996). One found locomotor stereotypies to be reduced shortly after filling a puzzle feeder, but no effect on self-injurious behavior (Novak et al., 1998). Although foraging devices are unlikely to cure severe behavior disorders, they are regarded as a useful part of an environmental enrichment program for captive primates. Foraging opportunities may prevent or reduce the development of abnormal be- havior in some animals and stimulate a wider range of normal activities, thus enhancing psychological well- being. “Foraging or task-oriented feeding methods” are specifically mentioned by the USDA as desirable ele- ments in an environmental enhancement plan (U. S. De- partment of Agriculture, 1991). Figure 1: Experienced pigtailed macaque demonstrates Puzzle Ball technique: left index finger in one of three holes, right hand When presented with a novel foraging puzzle (stacked steadying ball. (Photo by Carolyn M. Crockett) PVC tubes provisioned with peanuts), 3 of 9 macaques Recently, a foraging ball adapted from our Puzzle Ball quickly demonstrated aptitude, whereas others never design has become available commercially. One cus- solved it during seven opportunities (Heath et al., 1992). tomer indicated that the macaques in his facility were In a study of a similar device, only 3 of 8 Macaca fascicu- having some difficulties removing peanuts from the ball. laris were able to remove all the peanuts after 21 days of We speculated that this might be due to the inexperience experience (Murchison, 1991). These devices are rela- of the monkeys. tively expensive and difficult to clean, raising the ques- tion of cost vs. benefit when less than half of the monkeys We decided to test this idea by comparing Puzzle Ball seemed to be able to forage successfully. Seeking a for- use by monkeys that had been at our facility for some aging device that would be less expensive, easier to clean, time with its use by recent arrivals. We predicted that and used by more monkeys, we designed a Puzzle Ball monkeys recently arrived at WaNPRC would be less pro- ficient at using the Puzzle Ball, perhaps explaining the customer’s observations. Effectiveness of using the Puz- Carolyn Crockett, National Primate Research Center, Box 357330, University of Washington, Seattle, WA 98195-7330 [e- zle Ball as a foraging device was measured by the per- mail: [email protected]]. centage of time the monkeys spent manipulating the Puz- Thanks to Vern Davidson for adapting our Puzzle Ball into a zle Ball, the number of treats dropped, and the number of commercially available product (see “small foraging ball” at treats successfully removed and eaten. <www.steineronline.com>). No royalties are received by the inventors or the University of Washington, and the origi- Methods nal design is in the public domain (Crockett et al., 2001). Re- Data were collected on 22 individually housed non- search supported by NIH RR00166. human primates: 7 Macaca fascicularis (longtailed ma- 1 caques), 8 M. nemestrina (pigtailed macaques), and 7 Discussion Papio cynocephalus anubis (savanna baboons). Eleven As expected, we found a significant difference be- monkeys were new arrivals (1 to 3 months prior to data tween experienced monkeys and recent arrivals at collection) and 11 had been at WaNPRC at least 2 years. WaNPRC in skill at using the Puzzle Ball as a foraging Nine subjects were female and 13 were male (sex and device. This suggests that as exposure and experience recent arrival ratios were similar among the species). The with the Puzzle Ball increase so does effectiveness in us- subjects were 2 to 13 years of age. ing the Puzzle Ball as a foraging device. It might be pre- All subjects were housed at the WaNPRC, in individ- dicted that monkeys with more experience would spend ual cages sized appropriately for their weight as defined less time manipulating the Puzzle Ball because they by the USDA (U.
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