109the wood-chips looking <strong>for</strong> a<strong>nd</strong> eating grain even though that same grain was available fromhoppers full of the stuff nearby."Combette C, A<strong>nd</strong>erson JR 1991. Réponses à deux techniques d’enrichisse<strong>ment</strong> environ<strong>ment</strong>alchez deux espèces de prim<strong>ates</strong> en laboratoire (Cebus apella, Lemur macaco). Cahiersd'Ethologie 11, 1-16"Locomotion almost doubled in the lemurs when small food items were added to the litter, butonly the [group-housed] capuchins engaged in <strong>for</strong>aging activities to any extent."Grief L, Fritz J, Maki S 1992. Alternative <strong>for</strong>age types <strong>for</strong> captive chimpanzees. Laboratory<strong>Prima</strong>te Newsletter 31(2), 11-13http://www.brown.edu/<strong>Re</strong>search/<strong>Prima</strong>te/lpn31-2.html#grief"Chicken scratch, because it is small a<strong>nd</strong> harder to fi<strong>nd</strong> [in the litter], elicited the most <strong>for</strong>agingof the three foods ['sweet feed', popcorn]. It is very encouraging to see the chimpanzees still<strong>for</strong>aging late in the day <strong>for</strong> these small kernels. In addition, <strong>for</strong> subjects such as our bli<strong>nd</strong>animal, who had one of the highest <strong>for</strong>aging scores in our study, this [inexpensive] enrich<strong>ment</strong>cannot be overemphasized."Lutz CK, Novak MA 1995. Use of <strong>for</strong>aging racks a<strong>nd</strong> shavings as enrich<strong>ment</strong> tools <strong>for</strong> groups ofrhesus monkeys (Macaca mulatta). Zoo Biology 14, 463-474Antagonism decreased when the animals had to search <strong>for</strong> food in wood shavings.Mahoney CJ 1992. Some thoughts on psychological enrich<strong>ment</strong>. Lab Animal 21(5), 27,29,32-37Pans from rabbit cages can be used as <strong>for</strong>aging trays. "We fill the trays with wood chips or othertypes of bedding scattered with crushed maize, rice, or raisins, a<strong>nd</strong> attach them to the u<strong>nd</strong>ersideof the cage floors with bungie cords, thereby providing the animals with hours of searchingactivity."Stegenga L 1993. Modifying spider monkey behavior with the use of environ<strong>ment</strong>al variables.The Shape of <strong>En</strong>rich<strong>ment</strong> 2(3), 3-4"During baseline observations, the monkeys spent 7.3% of the time feeding, but when leaveswere added to the enclosure, feeding activities increased to 13.1% of the time. ... When theleaves were added to the enclosure, playtime was more significant."(4,3) Produce
110Baumans V, Coke C, Green J, Moreau E, Morton D, Patterson-Kane E, <strong>Re</strong>inhardt A, <strong>Re</strong>inhardtV, Van Loo P 2007. Making Lives Easier <strong>for</strong> Animals in <strong>Re</strong>search Labs - Chapter 4.4.Coconuts. Washington, DC: Animal Welfare Institutehttp://www.awionline.org/pubs/LAREF/enrich.html#coconuts"Rhesus don’t care much about coconuts, but stump-tailed macaques are fascinated by them a<strong>nd</strong>do not get tired ”working“ on them until the last morsel has disappeared in the drop pan. Itnever occurred that one of the monkeys somehow became injured while processing a nut.I give whole coconuts to our i<strong>nd</strong>ividually caged cynos. More than anything, they likethem <strong>for</strong> grooming purposes. It gives them something else to do besides bite themselves. I alsohad a female who carried her coconut arou<strong>nd</strong> as if it was a baby, constantly clutching it to herchest, a<strong>nd</strong> lip smacking to it, grooming it, etc. She was a chronic alopecia case. The coconutalleviated some — un<strong>for</strong>tunately not all — of her stereotypical hair pulling behavior."Baumans V, Coke C, Green J, Moreau E, Morton D, Patterson-Kane E, <strong>Re</strong>inhardt A, <strong>Re</strong>inhardtV, Van Loo P 2007. Making Lives Easier <strong>for</strong> Animals in <strong>Re</strong>search Labs - Chapter 4.3. Feeding<strong>En</strong>rich<strong>ment</strong>. Washington, DC: Animal Welfare Institutehttp://www.awionline.org/pubs/LAREF/enrich.html#feed-prim”I have given whole watermelons to group-housed rhesus, cynos, bonnet a<strong>nd</strong> stump-tailedmacaques <strong>for</strong> several years without noticeable adverse effects. It would be a waste of time to cutthe melons into small pieces. The monkeys first gnaw a hole into the ri<strong>nd</strong> a<strong>nd</strong> then ”dig“ into thesoft a<strong>nd</strong> juicy part. They really like this a<strong>nd</strong> are kept busy until the last morsel has been eaten.They usually discard the ri<strong>nd</strong>, but be<strong>for</strong>e they do so they thoroughly remove any soft materiala<strong>nd</strong> eat it. This usually cre<strong>ates</strong> quite a mess, but I don’t mi<strong>nd</strong> cleaning it up, because the animalsenjoy this type of feeding enrich<strong>ment</strong> so much.We give whole pumpkins to rhesus a<strong>nd</strong> cynos in both single- a<strong>nd</strong> group-housedenviron<strong>ment</strong>s. I would say that this is one of the most effective <strong>for</strong>aging device we have evergiven our animals. All of them spent hours processing their pumpkin!I give whole corn with the husk to our pair- a<strong>nd</strong> group-housed rhesus a<strong>nd</strong> baboons. Theylove it, a<strong>nd</strong> I enjoy observing them "peel a<strong>nd</strong> eat," leaving a big mess after they have finished.They gnaw the cob into little pieces that finally fall through the grid floor on the pans. I cannotsay whether they actually also eat pieces of the cob, but we have never encountered any healthrelatedproblem. I don't mi<strong>nd</strong> cleaning up the mess; its worth the treat!We use corn on the cob <strong>for</strong> all our caged cynos, rhesus a<strong>nd</strong> vervets. The animals give theimpression that they love processing a<strong>nd</strong> eating the corn. They typically pick the kennels bothwith their ha<strong>nd</strong>s a<strong>nd</strong> their teeth. When they are done, they proceed gnawing on the cob. I don’tknow if they actually ingest pieces of it. Even if they do, we have never encountered any clinicalproblems.“Beirise JH, <strong>Re</strong>inhardt V 1992. Three inexpensive environ<strong>ment</strong>al enrich<strong>ment</strong> options <strong>for</strong> grouphousedMacaca mulatta. Laboratory <strong>Prima</strong>te Newsletter 31(1), 7-8http://www.brown.edu/<strong>Re</strong>search/<strong>Prima</strong>te/lpn31-1.html#three"We distributed the following enrich<strong>ment</strong> materials on the floor once a week, each on a differentday: (1) 1 kg roasted peanuts in their shells; (2) 32 ears of hard corn; (3) one non-corrugatedcardboard box. ... After a habituation period of 8 weeks, [2-hour] behavioral observations weremade. ...The corn was the most effective eliciter of <strong>for</strong>aging activity, engaging the animals about77% of the time. Next in effectiveness was the box (65%) a<strong>nd</strong> finally the peanuts (47%)."
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Table of ContentsSpecies-typical Be
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2Behavioral Pathologies (Abnormal B
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Meyerson BJ 1986. Ethology in anima
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12Platt DM, Kinsey JH, Jorgenson MJ
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26Coe CL 1991. Is social housing of
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28Tatoyan SK, Cherkovich GM 1972. T
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30Line SW, Morgan KN, Markowitz H,
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44Choi GC 1993. Humans enrich the l
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54Lambeth SP, Hau J, Perlman JE, Ma
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