My mini, Bear, lived with four yearlings (Freezie, Sprinkles, Captain, and Pirate) for 6-8 months this past winter and spring. They got along well and often ran and played with each other (with Bear being the “fun uncle”). In May, the yearlings were moved out to pasture for the summer. When I was at the barn this past Friday, three of the four yearlings were there for the day to get their feet done by the farrier. Throughout the day, I heard Captain whinnying and calling a few times. Then when I was finishing my day, I happened to see Bear running and galloping back and forth along the fence in his pen. It was strange behavior for him so I went in to see him. I hung out with him for awhile, brushing and talking to him until I heard a horse whinnying and then Bear whinnied back. I realized that he knew that the yearlings were there, and he and Captain were calling to each other (even though they could not physically see each other in their respective pens). I took Bear out and we walked over to the pen where the yearlings were. Bear and the “babies” touched noses and nuzzled each other through the fence. They clearly knew and remembered each other, and appeared happy to be together again.