我簡單把原文意思介紹了一下，呵呵翻譯的不好多原諒。
原文如下：
Pigs straighten tails when bored, Dutch scientists say
Asian Economic News, August 23, 2004
Pigs straighten their tails when bored and stressed, Dutch scientists have detected.
This in turn can serve as a warning sign that within days they will start biting each other's tails, a habit that can cause serious injury and death.
Two to three days before pigs start biting each others' tails, they straighten their tail and hide it between their hind legs,'' Johan Zonderland, a researcher from Wageningen University in the Netherlands told Kyodo News. ''The animals stay like that for days until they start biting.''
Zonderland and his collaborators carried out their research over a period of three months. They carefully observed 1,000 pigs that still had their tails.
Most pig farmers cut off their pigs' tails to avoid the risk of tail-biting. Only biological farmers leave the animals as they are.
The research fits into a growing discussion about animal welfare. Animal rights groups say intensive agriculture creates psychological and physical health problems as too many pigs are gathered together in a small area.
It is the first time in the world that in-depth research has been carried out into the reasons behind "tail-biting,'' said Zonderland, whose country is one of the world's major exporters of pork products. These results will make it easier for farmers to detect problems in time. They can give the pigs some extra straw or toys to play with to prevent them hurting one another.''
:victory: