Animal genetic resources for food and agriculture crop and livestock species in the early neolithic time period changed our human evolution and lifestyles. This ability to control food production led to major demographic, technological, political and military changes. Consecutively, thousands of years of natural and human selection, genetic drift, inbreeding, and crossbreeding have contributed to the diversification of animal genetic resources and increased the variety of environments and production systems that livestock keeping takes place. Relatively few species have been domesticated; out of the world's 148 non-carnivorous species weighing more than 45 kg, only 15 have been successfully domesticated. The proportion of domesticated birds used for food
The Birds of America Audubon. Due in part to the Civil War, the edition was never finished; only 15 parts of the 44 part series were completed. This edition consisted of 105 plates and included none of the original text. Fewer than 100 subscriptions were sold, making this edition rarer than other early editions. Audubon's practice of obtaining his subjects has been described as:“Audubon used what we like to call today as the barrel-of-the-shotgun method...After he killed the birds, he would use a complex system of wires and strings to position the birds. Previous artists would draw the birds in a stiff position, but