Regarding ethics, hunter's often feel the need to defend themselves and justify their actions. They truly believe that hunting is ethical when done right. According to Orion the Hunter's Institute, aside from hunter's safety and the issue of killing animals cleanly, quickly, and humanely, there are very few ethical issues involved in how the practice of hunting is conducted.
What hunter's generally think of as the "ethics of hunting" refers to the specific rules that that govern a particular form of hunting or different style of hunting. Each genre of hunting has a loyal following and an internally consistent set of rules and ethical standards. But most agree on the same general ethical standards regarding the well-being of the animals and their environment.
Hunter's argue that being shot and killed quickly and painlessly is a better way to go than most animals do. There is usually a specific time of year, a season, when you can hunt particular animals. Often this season comes just before the winter. Many individual wild animals do not survive the winter due to lack of food which leads to starvation, or disease. This especially pertains to overpopulated species that reproduce beyond the environment's carrying capacity.
Hunter's argue that nothing could be more natural than hunting, and just about every animals species, including humans, have been either predator or prey at some point in its evolution. They believe that as long as the animals are killed quickly, cleanly, and humaely, there is no ethical issue regarding the sport of hunting.
"To educate a man in mind and not in morals is to educate a menace to society" Theodore Roosevelt
This goes hand in hand with hunter education. Said another way, "to educate a hunter in safety and skills and not in ethics is to educate a menace to our conservation legacy." (Orion the Hunter's Institute)
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click here to watch the 60 Minutes special on the subject
Sources:
CBS, 60 Minutes:
http://www.cbs.com/shows/60_minutes/video/2191286383/pro-hunting-it-s-ethical-when-done-right
Orion the Hunter's Institute
http://www.huntright.org/where-we-stand/ethics-vs-preferences