metropolis
本站元老
- 注册
- 2010-12-10
- 消息
- 8,357
- 荣誉分数
- 1,533
- 声望点数
- 323
这些野猪并非北美原生,40年前从非洲引进,20年后达到顶峰,后来市场崩溃,有些被农民放生,造成泛滥,失控。每年造成美国农作物25亿损失。
A population of hard-to-eradicate ‘super pigs’ in Canada is threatening to invade the US
1 of 3 |
FILE - In this Feb. 18, 2009 file photo, feral pigs roam near a Mertzon, Texas ranch. Minnesota, North Dakota and Montana and other northern states are making preparations to stop a threatened invasion from Canada. Wild pigs already cause around $2.5 billion in damage to U.S. crops every year, mostly in southern states like Texas. But the exploding population of feral swine on the prairies of western Canada is threatening spill south. (AP Photo/Eric Gay, File)
2 of 3 |
FILE - In this June 17, 2014, file photo, a wildlife trapper, walks past damage from feral hogs that happened overnight while foraging near one of his traps in New Orleans. An exploding population of hard-to-eradicate “super pigs” in Canada is threatening to spill south of the border, and northern states like Minnesota, North Dakota, Montana are taking steps to stop the invasion. (AP Photo/Gerald Herbert, File)
3 of 3 |
FILE - Two feral hogs are caught in a trap on a farm in rural Washington County, Mo., Jan. 27, 2019. Minnesota, North Dakota and Montana and other northern states are making preparations to stop a threatened invasion from Canada. Wild pigs already cause around $2.5 billion in damage to U.S. crops every year, mostly in southern states like Texas. But the exploding population of feral swine on the prairies of western Canada is threatening spill south. (David Carson/St. Louis Post-Dispatch via AP, file)
Pigs are not native to North America. While they’ve roamed parts of the continent for centuries, Canada’s problem dates back only to the 1980s when it encouraged farmers to raise wild boar, Brook said. The market collapsed after peaking in 2001 and some frustrated farmers simply cut their fences, setting the animals free.
最后编辑: