According to the Rare Breed Survival Trust, Britain is home to 139 unique breeds of sheep, cattle, pigs and poultry, many in danger of extinction. Each one – from North Ronaldsay sheep to Aylesbury ducks – is described and illustrated in this handbook, detailing its breeding history, genetic makeup, local origins, the quality of its meat, wool or milk, its conservation status, and current efforts to ensure its survival.