Figure 1.

(a) Presentation arena schematic. The presentation arena was separated from the field by a solid metal fence (solid line). Within the arena, enclosures consisted of portable metal fencing with bars approximately 10 cm apart (dotted lines). The subject (1) was placed in the central enclosure after two stimulus goats (2) had been placed in the triangular enclosures. A camera and speaker (3) were located equidistant between the stimulus goats, facing the subject. The arena was located against a timber fence (dashed line) with vegetation behind (4) to prevent other animals from moving behind the stimulus and minimize visual distractions to the subject. (b) A photo of the presentation arena.