这个现象在无脊椎动物中已经广泛的被研究过，而且在马、牛和某些鹿中也有出现。
The phenomenon has been most extensively studied in invertebrates, but is also seen in horses, cows and some species of deer.
马与人类的这种联系也许是其野外行为的延续，因为马匹珍惜自己的马亲戚和马朋友，也乐于接受无威胁性的新相识。
The bond with humans likely is an extension of horse behavior in the wild, since horses value their own horse relatives and friends, and are also open to new, non-threatening acquaintances.
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