generate questions: Only a few contemporary societies are classified as hunter-gatherers, and many supplement their foraging activity with horticulture and/or keeping animals.
How many groups of modern hunter-gatherers are there? {sep_token} What do modern hunter-gatherers use to produce food in addition to gathering? {sep_token} Who uses agriculture and animal domestication to supplement their food? {sep_token} Besides  agriculture, how do gatherers add to their food supply? {sep_token} In addition to domesticated animals, how do gatherers supplement their food? {sep_token}