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With the focus on the well-being of the animals, enrichment is used to maintain both physical and mental health. By providing challenges and stimulation, the keepers aim to encourage natural behaviours different species would have in the wild.

For the chimpanzees, this means finding clever ways of getting porridge out of lengths of tubing, while for the crowned lemurs it involves an eclectic collection of old fire hoses, yoghurt, corn flakes and camelia flowers.

Introducing a pair of tigers is a tense business when they are capable of badly injuring, or even killing, each other, but it has to be done if there is to be a possibility of breeding. Also at Highland Wildlife Park, senior keeper Mo checks in with the elk and bison.

A newly arrived pair of sloths are put together for the first time, and it鈥檚 a predictably long, drawn-out affair. Meanwhile, the zoo鈥檚 large group of rainbow lorikeets is leaving Edinburgh, and when the bird team hand-rear some chicks it becomes clear that the ugliest youngsters often turn out to be the most beautiful adults.

Narrated by Gail Porter.