What Are Weid Or Abnormal Behavior In Zoo Animals

doi: x.1371/journal.pone.0020101. Epub 2011 Jun 16.

How abnormal is the behaviour of captive, zoo-living chimpanzees?

Affiliations

• PMID: 21698219
• PMCID: PMC3116814
• DOI: ten.1371/journal.pone.0020101

Free PMC article

How abnormal is the behaviour of captive, zoo-living chimpanzees?

Lucy P Birkett  et al. PLoS One. 2011 .

Complimentary PMC article

Abstract

Background: Many captive chimpanzees (Pan troglodytes) show a diverseness of serious behavioural abnormalities, some of which have been considered as possible signs of compromised mental wellness. The provision of environmental enrichments aimed at reducing the functioning of abnormal behaviours is increasing the norm, with the housing of individuals in (semi-)natural social groups thought to exist the most successful of these. Only a few quantitative studies of aberrant behaviour accept been conducted, however, particularly for the captive population held in zoological collections. Consequently, a clear movie of the level of abnormal behaviour in zoo-living chimpanzees is lacking.

Methods: We nowadays preliminary findings from a detailed observational study of the behaviour of forty socially-housed zoo-living chimpanzees from 6 collections in the U.s.a. of America and the Uk. We determined the prevalence, diverseness, frequency, and duration of abnormal behaviour from 1200 hours of continuous behavioural data collected by focal brute sampling.

Results, conclusion and significance: Our overall finding was that abnormal behaviour was present in all sampled individuals beyond six contained groups of zoo-living chimpanzees, despite the differences between these groups in size, limerick, housing, etc. We found substantial variation betwixt individuals in the frequency and duration of aberrant behaviour, only all individuals engaged in at least some aberrant behaviour and variation across individuals could not exist explained by sex, age, rearing history or groundwork (divers every bit prior housing conditions). Our data support a conclusion that, while most behaviour of zoo-living chimpanzees is 'normal' in that it is typical of their wild counterparts, aberrant behaviour is endemic in this population despite enrichment efforts. We advise there is an urgent need to sympathise how the chimpanzee mind copes with captivity, an issue with both scientific and welfare implications.

Disharmonize of interest argument

Competing Interests: The authors accept declared that no competing interests exist.

Figures

Figure 1. Percent of chimpanzees from six independent zoological collections displaying each of the indicated abnormal behaviours.

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