They remember your scent for life.
They know where all their relatives are as they smell their hoof prints on the ground.
To help understand them imagine reducing your senses to their level, sight only goes so far in scrub, so sound and scent they work with.
They have scent glands in the eye duct for head height scent markers, back leg glands for resting/bedding scent markers and scent glands between hooves for ground based scent.
Their knowledge of sound would fill a book as would more than the over simplification of their capabilities and uses/importance of scent mentioned above, they know their whole world this way.
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