Table 3.

Ethogram used for video analysis.

Behavior	Definition
Exploration	The animal searches for information by walking around the testing area or by sniffing or touching the person or object.
Interactions with another horse (Interaction)	Interactions with the untested horse through physical or visual contact.
Latency to obtain the treat (Latency 1)	Time the horse takes to approach the bucket and obtain the treat in all the phases.
Latency to obtain the treat after the umbrella opens (Latency 2; only in the 2nd experiment)	Time the horse takes to approach the bucket again after the umbrella opens in phase 3.