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1. 獣耳会社ｗａｎ (wan@poa.st)'s status on Monday, 11-Dec-2023 00:50:39 JST 獣耳会社ｗａｎ

   in reply to
   @WoodshopHandman @TexOffender The horse anus is a marvel of evolutionary biology.
   
   Like most mammals, rhythmic contractions of a horse's bowels move the feces up to the end of the gut to be expelled.
   
   What sets the horse anus apart is the bafflingly complex autonomic motion of 4 muscular rings which function like a spherical guillotine.
   
   As the feces is squeezed out, the rings expand and the outermost ring is retracted into an interior skin-fold resembling the human foreskin, leaving an interstitial tissue fold to open air. The two inner rings then contract and push apart, severing the horse feces cleanly, allowing it to drop free as the outer ring folds back through the interstitial flap, creating an intrinsic wiping motion with the fourth ring as it contracts back into the horse's rectum.
   
   This advanced biological mechanism is so effective that many industrial companies have copied Nature's design for self-cleaning viscous liquid dispensers housed within complex machinery.