Plot: Factual series about working animals, presented by John Barrowman. An affectionate Mangalitza pig makes the jump from model mum to megastar to help save her rare breed, an athletic dog in the Czech Republic trains for the canine-powered cycling sport known as bikejoring, Cedric the silkworm spins his prized cocoon in Kenya and a dedicated dog chases away unwelcome birds from a US Coast Guard base