New project to breed sheep with a naturally low carbon-footprint. Sheep farmers and scientists are taking part in a £3 million Defra project to measure the methane emitted by sheep, monitoring around 13,000 animals across 45 different flocks. All week we're looking at eggs. According to the industry body British Lion Eggs, we ate 5.9 billion of them in the UK last year. Nearly three quarters of the eggs we eat in the UK are free range , so to begin our week we're speaking to the British Free Range Egg Producers Association. A conservation project to reintroduce the UK's rarest reptile on heathland in Devon. Numbers of smooth snakes have dwindled as their habitats have disappeared. Presenter = Caz Graham Producer = Rebecca Rooney