Episode 2

Some of the world's most endangered species are at risk when a potentially fatal disease makes it on to the estate. Keepers in the giraffe house are on tenterhooks as they wait to see if a newborn calf survives the critical first few days. And it looks a bit like a bear and a bit like a cat but smells of popcorn - will an exotic new arrival be the key to a breeding programme that could save a species?