Dr Bracke also looked at other hoofed animals, such as deer.
马克博士也观察了其它有蹄动物，比如鹿。
"If so, wallowing could be an important element of a good life in pigs," said Dr Bracke.
“如果是这样的话，在水里打滚可能是猪美好生活的重要部分。”马克博士说。
But more fundamentally, Dr Bracke suggests the behaviour could have evolved in pigs' most ancient relatives.
但更重要的是，马克博士提出猪此种行为演变形成于猪最古老祖先。
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