Humans have hunted caribou, or wild reindeer, for ages. Their numbers are numerous. Since reindeer meat is so popular in in circumpolar and Scandinavian countries, why not feed the rest of the world with reindeer? One organization proposed using airplanes to shoot down reindeer with machine guns. The method, while brutal, wouldn't endanger the species as long as the number of reindeer bulls killed per year didn't exceed one million. The Canadian Government even formed an organization called the Caribou Commission to study how airplanes could be used to shoot caribou and distribute its meat to butcher shops. In addition to killing the reindeer, planes could help locate and drive herds to areas near slaughterhouses.
Read the full story in "How Caribou Meat Obtained by Airplane Would Increase World Food Supply"