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 Tortoise and the Birds by Chinua Achebe. The tortoise, who is a West African trickster figure, hears of a feast to be given by the sky-dwellers to the birds and persuades them to take him with them, winged in their feathers. There he tells the hosts that his name is 'All-of-you' and, when they provide the food with the assurance that 'This is for all of you', claims the entire feast. The enraged birds claim their feathers back and leave. Only the parrot will agree to take a message to the tortoise's wife to pull the bedding from his house and leave it on