Lacking such well-developed, natural adaptations, humans use their intelligence as an advantage when hunting. From hunting in groups using clubs and stones to the current use of modern firearms, humans have been successful at obtaining animal and plant foods from the wild. In North America, many aboriginal people still hunt as part of their cultural and social traditions. Many non-natives also hunt as part of a chosen lifestyle that often includes activities, such as gardening, fishing, trapping, and cutting firewood. All plant and animal species have evolved so that each has a strategy that helps to ensure their future survival.
Many species produce more young than available habitat can support.
There is only so much food and shelter available, particularly during the winter. Old age is seldom an option in the wild. Only those that elude predators, find enough food to sustain themselves, escape disease, and avoid accidents, will survive. Natural mortality factors help ensure that there is room for next year's crop of young. By being fruitful and multiplying, nature increases the chances that enough animals, young and adult, will survive to reproduce and perpetuate themselves next year.