Take the famous case of at the Berlin Zoo. For years, Nanny shared a paddock with a group of Scimitar-horned Oryx (extinct in the wild). When a young, orphaned oryx was introduced to the herd, the oryx didn't bond with its own kind. Instead, it followed Nanny everywhere. The zookeepers documented the pair sleeping side-by-side, the massive horse grooming the tiny antelope with her velvet lips, and the oryx chasing away any bird that landed on Nanny’s back.
Scientific studies show that horses have "best friends." They will consistently choose to graze, sleep, and travel next to a specific individual over others in the herd. Cross-Species Companionship: zoo sex animal sex horse hot