this post was submitted on 29 Aug 2023
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No Stupid Questions
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Yes it is the middle finger/toe.
http://rspb.royalsocietypublishing.org/content/284/1861/20171174
Horses have 5 fingers/toes in their genetic, but only the middle ones develop. The reason is that one finger/toe has advantages for a huge weight and wanting to run quite fast.