aristotle primarily divided 'sensitive' biological organisms into animals and 'non-sensitive' biological organisms as plants. unlike livestock, which have become tamed for at least a few century and have a much different appearance and character to their inhabitants in the wild, wild animals have intrinsic characteristics. people are accustomed to be more familiar to livestock and often know their original form as livestock. but, the difference between the livestock and wild fauna is that livestock evolved in a direction favorable to human, whilst other fauna still consist their wild instinct. to have a clear insight of south korea's wild fauna, in the case of wolves, unlike dogs that evolved to actively pursue cooperation with humans, they do not show any reliance on humans. the wild version of the pig, the wild boar, is larger on average than the pigs used for food, and also has long hair with sharp tusks.