Table 1. Factors affecting the characteristics of trips conducted between visits to waterholes.

	Estimate [95% C.I.]
A. Distance traveled (km)
Looping	−0.271 [−2.259/1.771]
Commuting	3.247 [0.583/5.900]
Trip duration (h)	0.402 [0.339/0.463]
Commuting * Trip duration	0.021 [−0.050/0.091]
B. Maximum distance to start/end waterhole (km)
Looping	0.714 [−0.023/1.456]
Commuting	1.019 [−0.088/2.127]
Trip duration (h)	0.134 [0.106/0.162]
Commuting * Trip duration	0.008 [−0.029/0.045]
C. Speed (km/h)
Looping	0.456 [0.346/0.569]
Commuting	0.371 [0.199/0.541]
Trip duration (h)	−0.001 [−0.003/0.001]
Commuting * Trip duration	−0.005 [−0.009/−0.002]

Distance traveled (A), maximum distance to start/end waterhole (B) and mean speed (C) were regressed against explanatory variables in linear mixed models with elephant identity as a random effect on intercept and slopes. The waterhole at the beginning of the trip is either different (commuting trip) or the same (looping trip) than the waterhole at the end of the trip. Estimates of the reference intercept (looping trips) and of deviations associated to other levels of explanatory variables are presented, with 95% confidence intervals obtained by parametric bootstrap with 10000 samples. Estimates for which the 95% confidence interval do not include zero are in bold.