Fig. 1

Photographs illustrating the various methods of attachment utilized in this study. a The activity monitors were threaded onto separate collars using the provided metal loops on the monitors. This method of attachment was utilized in Experiments 1 & 2. b The activity monitors were threaded onto separate collars using the provided metal loops on the monitors and a leash was attached to the rostral collar. This method of attachment was utilized in Experiment 3. c The activity monitors were threaded onto the same collar in the same orientation using the provided metal loops on the monitors. This method of attachment was utilized in Experiment 4. d The activity monitors were threaded onto the same collar in opposite orientations using the provided metal loops on the monitors. This method of attachment was utilized in Experiment 5. e The activity monitors were placed on the same collar. One monitor was threaded on using the provided metal loop on the monitor. The other activity monitor was placed in the same orientation as the first, but inside a metal protective case on the same collar. This method of attachment was utilized in Experiment 6. f One activity monitor was attached using the provided metal loop on the monitor. The other monitor was rotated 90° and attached to the same collar using zip-ties. This method of attachment was utilized in Experiment 7