ZSL Whipsnade Zoo, as it is now branded, opened in May 1931 – a little over a year before this film was made, and is Britain’s largest zoo and wildlife park, spreading over 600 acres. The only other zoo owned and run by ZSL (Zoological Society of London) is ZSL London Zoo in Regent’s Park. Some of the larger animals featured in the film are most likely those taken on from a bankrupt travelling menagerie, and some were walked to the park from nearby Dunstable station.