- The West Tunnel is a pedestrian subway leading under the Outer Circle, made to improve circulation to and from t he Middle Gardens in response to the increasing number of visitors. This was the first building work taken up after World War One. The concrete tunnel vault is decorated with paintings in the style of those of the caves of Lascaux and Altamira. Built 1919-20, in fulfilment of the 1913 scheme by Captain George Swinton with the Zoological Society of London's Garden Committee. Vault paintings 1954, by a team of students from the Royal Academy of Arts School of Painting working under Henry Rushbury. The paintings were lost in 2000 when the tunnel was strengthened.
- The Buildings of London Zoo
BT London Zoo