<P> Early inhabitants of the Americas developed agriculture, developing and breeding maize (corn) from ears 2--5 cm in length to the current size are familiar today . Potatoes, tomatoes, tomatillos (a husked green tomato), pumpkins, chili peppers, squash, beans, pineapple, sweet potatoes, the grains quinoa and amaranth, cocoa beans, vanilla, onion, peanuts, strawberries, raspberries, blueberries, blackberries, papaya, and avocados were among other plants grown by natives . Over two - thirds of all types of food crops grown worldwide are native to the Americas . </P> <P> The natives began using fire in a widespread manner . Intentional burning of vegetation was taken up to mimic the effects of natural fires that tended to clear forest understories, thereby making travel easier and facilitating the growth of herbs and berry - producing plants that were important for both food and medicines . This created the Pre-Columbian savannas of North America . </P> <P> While not as widespread as in other areas of the world (Asia, Africa, Europe), indigenous Americans did have livestock . Domesticated turkeys were common in Mesoamerica and in some regions of North America; they were valued for their meat, feathers, and, possibly, eggs . There is documentation of Mesoamericans utilizing hairless dogs, especially the Xoloitzcuintle breed, for their meat . Andean societies had llamas and alpacas for meat and wool, as well as for beasts of burden . Guinea pigs were raised for meat in the Andes . Iguanas and a range of wild animals, such as deer and pecari, were another source of meat in Mexico, Central, and northern South America . </P> <P> By the 15th century, maize had been transmitted from Mexico and was being farmed in the Mississippi embayment, as far as the East Coast of the United States, and as far north as southern Canada . Potatoes were utilized by the Inca, and chocolate was used by the Aztecs . </P>

In the pre-columbian era what were the only domesticated beasts of burden in the americas