Horse slaughter is the practice of slaughtering horses to produce meat for consumption. Humans have long consumed horse meat; the oldest known cave art, the 30,000-year-old paintings in France's Chauvet Cave, depict horses with other wild animals hunted by humans. Equine domestication is believed to have begun to raise horses for human consumption. The practice has become controversial in some parts of the world due to several concerns: whether horses are (or can be) managed humanely in industrial slaughter; whether horses not raised for consumption yield safe meat, and whether it is appropriate to consume what some view as a companion animal. Methods In most countries where horses are slaughtered for food, they are processed in industrial abattoirs similarly to cattle. Typically, a penetrating captive bolt gun or gunshot is used to render the animal unconscious. The blow (or shot) is intended to kill the horse instantly or stun it, with exsanguination (bleeding out) conducted immediately afterwards to ensure death. Saleable meat is removed from the carcass, with the remains rendered for other commercial uses. According to equine-welfare advocates, the physiology of the equine cranium is such that neither the penetrating captive bolt gun nor gunshots are reliable means of killing (or stunning) a horse; the animal may be only paralyzed. Unless properly checked for vital signs, a horse may remain conscious and experience pain during skinning and butchering. History Some countries, such as Italy, Belgium, and France have maintained a tradition of eating horse meat. Horse meat also was a traditional protein source during food shortages, such as the early-20th-century World Wars. Before the advent of motorized warfare, campaigns usually resulted in tens of thousands of equine deaths; troops and civilians ate the carcasses, since troop logistics were often unreliable. Troops of Napoleon's Grande Armée killed almost all of their horses during their retreat from Moscow to feed themselves. In his biography, Fifty Years a Veterinary Surgeon, Fredrick Hobday wrote that when his British Army veterinary field hospital arrived in Cremona from France in 1916 it was the subject of a bidding war (won by Milanese horse-meat canners) for salvageable equine carcasses. During World War II, the less-motorized Axis troops lost thousands of horses in combat and during the unusually-cold Russian winters. Malnourished soldiers consumed the animals, often shooting weaker horses as needed. In his 1840s book, London Labour and the London Poor, Henry Mayhew wrote that horse meat