马克博士分析认为，猪在泥巴里打滚，像鹿在地上滚一样，都能扮演繁衍后代的角色。
That analysis has led Dr Bracke to propose that mud wallowing, like rolling, could play a role in reproduction in pigs.
马克博士也观察了其它有蹄动物，比如鹿。
Dr Bracke also looked at other hoofed animals, such as deer.
米勒博士指出，美洲狮能够捕捉到人类无法发现的细微的疾病信号。例如，病鹿的行为反应会稍显迟缓。
Dr. Miller said the mountain lions might notice signs of illness that were too subtle for humans to see — slightly slower reaction times, for example.
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