Context: Varmint hunting is an American phrase for the selective killing of non-game animals seen as pests. While not always an efficient form of pest control, varmint hunting achieves selective control of pests while providing recreation and is much less regulated. Varmint species are often responsible for detrimental effects on crops, livestock, landscaping, infrastructure, and pets. Some animals, such as wild rabbits or squirrels, may be utilised for fur or meat, but often no use is made of the carcass. Which species are varmints depends on the circumstance and area. Common varmints may include various rodents, coyotes, crows, foxes, feral cats, and feral hogs. Some animals once considered varmints are now protected, such as wolves. In the US state of Louisiana, a non-native rodent known as a nutria has become so destructive to the local ecosystem that the state has initiated a bounty program to help control the population.

Question: What is varmint hunting an American phrase for?
Answer: selective killing of non-game animals seen as pests

Question: What does varmint hunting achieve? 
Answer: selective control of pests

Question: What detrimental effects are varmint species often responsible for visiting on?
Answer: crops, livestock, landscaping, infrastructure, and pets.

Question: Where has a non-native rodent known as a nutria become very destructive?
Answer: Louisiana

Question: What has the state of Louisiana done to combat the nutria?
Answer: initiated a bounty program

Question: What is phrased for selective killing of non-game animals.
Answer: Varmint hunting

Question: What was once considered a varmint but is now protected?
Answer: wolves

Question: What is the non-native varmint of Louisiana?
Answer: nutria

Question: What did Louisiana initiate to control the varmint population?
Answer: bounty program

Question: What has the state of Louisiana created to control the population of wild rabbits?
Answer: Unanswerable

Question: What were crows once categorized as but are not longer considered to be?
Answer: Unanswerable

Question: What are nutria often used for when hunted?
Answer: Unanswerable

Question: What does having livestock cause detrimental effects on when you own a farm?
Answer: Unanswerable

Question: What does having livestock help achieve the control of?
Answer: Unanswerable