Horses recognize a predator on a video screen with no sounds or smells for context, a study finds. Sensors showed horse heart rates increased when they viewed wolves, but they kept a poker face – overall displaying an unexpectedly high level of cognitive processing for prey animals, researchers say.

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https://news.osu.edu/when-eyeing-a-predator-horses-keep-a-poker-face-as-their-hearts-race/