Boys -- Juvenile fiction. Gorilla -- Juvenile fiction. Zoo animals -- Juvenile fiction. Zoo keepers -- Juvenile fiction. World War, 1939-1945 -- Juvenile fiction.

World War, 1939-1945 -- Juvenile fiction. Gorilla -- Juvenile fiction. Human-animal relationships -- Juvenile fiction. London (England) -- Juvenile fiction. London Zoo (London, England) -- Juvenile fiction.

繪本

知覺 錯覺 記憶 思考

Gorilla -- Juvenile fiction. Zoo animals -- Juvenile fiction. Identity (Psychology) -- Juvenile fiction. Stories in rhyme. Gorilla -- Fiction.

Gorilla -- Juvenile fiction. Elephants -- Juvenile fiction. Friendship -- Juvenile fiction. Animal welfare -- Juvenile fiction.