By contrast, in dry environments, the only long-term assemblages are a female and her offspring, sometimes just a foal, sometimes a foal and a yearling.

• 相反地，在乾燥环境下，唯一长期稳定的关系就只存在于雌马和子代之间，有时是一只马仔，有时是一只马仔加上刚满一岁的小马。