Zoological Society of London

Keeper with seal, circa 1870 Photograph: Zoological Society of London

Sam the polar bear, September 1912 Photograph: Zoological Society of London

Giraffe Photograph: Zoological Society of London

Keeper with king penguin, 1914 Photograph: Zoological Society of London

Tiger and bear, April 1914 Photograph: Zoological Society of London

H Warwick with tiger and peccary, May 1914 Photograph: Zoological Society of London

Superintendent R I Pocock with kinkajou, 1914 Photograph: Zoological Society of London

Zebra ride outside ZSL offices, June 1914 Photograph: Zoological Society of London

Keeper and Elephant, 1914 Photograph: Zoological Society of London

John the gorilla, 1919 Photograph: Zoological Society of London

Chapman's zebra, circa 1920 Photograph: Zoological Society of London

Llama Ride, circa 1920 Photograph: Zoological Society of London

H Warwick with baby warthog, 1922 Photograph: Zoological Society of London

Keepers trimming elephant's feet, 1923 Photograph: Zoological Society of London

Elephants walking from the docks through Camden, 1923 Photograph: Zoological Society of London

Keeper inspecting a common hippo, 1923 Photograph: Zoological Society of London

Orangutan, 1923 Photograph: Zoological Society of London