Behaviour and Welfare Impacts of Releasing Elephants from Overnight Tethers: A Zimbabwean Case Study.

Abstract

Simple SummaryIn the southern African elephant tourism industry, many elephants are routinely chained or tethered for prolonged periods of time, particularly overnight. There are many negative implications of such restrictive management on elephant welfare. In this pilot study, a group of four male semi-captive African elephants at a tourist facility in Zimbabwe were being taken off overnight tethers and put into small pens, as a strategy to improve elephant welfare. Behavioural data were collected when elephants were on tethers, and approximately four weeks and eight weeks after removal of tethers. Behavioural changes were noted, after removal of tethers, which were indicative of improved welfare (e.g., increased lying rest, increased positive social behaviour and reduced abnormal repetitive behaviours). Importantly, there were no significant increases in aggression (either to their human handlers or to other elephants) following this change in management. To improve elephant welfare in southern African tourism facilities, we strongly advocate management practices which enable greater choice and freedom of movement overnight, which includes ceasing the use of overnight tethers and provision of opportunities for physical interaction with other elephants overnight. Within the southern African elephant tourism industry, chaining or tethering elephants is still a relatively routine practice, despite the known negative impacts. Cited reasons for chaining include fear of aggressive interactions between elephants when handlers are absent, or a general increase in expression of aggressive behaviours (both to other elephants and to their human handlers). In Zimbabwe, concerns expressed include the danger of elephants escaping and entering human-inhabited areas. Four male semi-captive elephants at a Zimbabwe tourist facility were taken off overnight (~12 h) tethers and were placed in small pens (‘bomas’), approximate sizes from 110 m2 to 310 m2), as part of a strategy to improve elephant welfare. Behavioural data were collected from overnight videos from December 2019 to March 2020, between 18:00 to 06:00, using focal, instantaneous sampling (5-min interval). Data were collected for three nights at three time periods: (i) Tethered; (ii) approximately four weeks post-release; (iii) approximately eight weeks post-release. Behavioural change over these time points was analysed using general linear models with quasibinomial error structures. Behavioural changes indicative of improved welfare were observed following these management changes, and no significant increases in aggression were observed either between elephants, or towards their human handlers. Proportion of time engaging in lying rest was higher in the first month after release from tethering (mean ± SD, 50 ± 14%) than when elephants were tethered (20 ± 18%) (p < 0.05). Additionally, although not statistically significant, stereotypies were reduced when elephants were no longer tethered (4 ± 6% observations tethered compared to 2 ± 2% off tethers), and positive social behaviour also increased (1 ± 1% on tethers, 2 ± 2% off tethers), with the greatest improvements seen in the pair-housed elephants. To improve elephant welfare in southern African tourism facilities we strongly advocate that less restrictive management practices which enable greater choice and freedom of movement overnight are implemented.