20-part series began airing on British terrestrial TV on 8 October 2007, transmitting on weekday evenings in a regular 6:30 pm slot. A second 20-part series of Zoo Days was swiftly commissioned and began airing on 3 March 2008. The third 20-part series was broadcast from Colchester Zoo, before returning to Chester for the fourth 20-part series on 10 November 2008. In February 2009, "The History of Chester Zoo" was a contestant's chosen subject on Mastermind. In 2014 the zoo was the subject of BBC One drama Our Zoo, telling the story of the founding of Chester Zoo by the Mottershead family in the 1930s. During the six-part series, the show reached audiences in excess of five million viewers and was nominated for two National TV awards. In January 2016, Channel 4 began broadcasting a six-part series, The Secret Life of the Zoo, following the keepers and animals at Chester Zoo and narrated by Olivia Colman from Series 1 to 5 and Tamsin Grieg since Series 6. The series was a rating's success and was recommissioned for a second series. Series 2 aired at the end of 2016. The show has now run for ten seasons with a compilation series in 2020. References External links Chester Zoo rECOrd (Local Biological Records Centre for Cheshire) "My father, the zoo builder", BBC, 3 September 2014 Google Earth view of Chester Zoo from above Link to 1936 Ordnance Survey map of where Chester Zoo is now, and around (Slide the slider at bottom left of the map to get rid of the overlay.) 1898 Ordnance Survey map including where Chester Zoo is now Oakfields is lower-central. 1931 establishments in England Animal charities based in the United Kingdom Buildings and structures in Chester Tourist attractions in Cheshire Zoos established in 1931 Zoos in England