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Clive Cookson DECEMBER 6, 2017 12 Remarkably few plant and animal species dominate global agriculture and food production. Cattle, sheep, pigs and poultry make up most of the livestock sector, while wheat, maize, rice and soya account for 60 per cent of the world’s total crop output. Fewer than 30 species account for more than 95 per cent of human food needs.