One of the Mule Deer’s most distinct features is its big "mule-like" ears. Each ear rotates independently like a scanning radar.
Without this early warning system, the Mule Deer could not detect as easily the rustle of a cougar slipping up from behind. Although in this case the fawn has his back up against a wall preventing any ambush from behind.
Young of the year see Journal
https://inaturalist.ca/journal/larryhalverson/28901-swivel-ears
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