Horses are very smart. They can recognize voices of their keepers even if they did not hear them for 10 years or more.
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scientificamerican.com 
https://www.scientificamerican.com/podcast/episode/horses-recognize-pics-of-their-keepers/ 
More Offbeat » 
Horses are very smart. They can recognize voices of their keepers even if they did not hear them for 10 years or more.