Karl Hoeffkes film of the Zoo, circa 1940.
German film "Berlin bleibt Berlin" (Berlin Will Remain Berlin), circa 1930's. Zoo footage at the 4:22 mark.
From The documentary, Third Reich Rise and Fall, footage of the Zoo at 12:01 mark.
Footage of Hitler's mistress, Eva Braun, at the Berlin Zoo, circa 1940.
Nazi propaganda film from 1936, zoo footage at 6:58 mark.
Stills from a British Pathe film on Life in Berlin, 1930-1939. At the 3:30 mark there are images of the Zoo, featuring elephants, hippos and Bobby the Gorilla.
Footage of the Berlin Zoo sometime in the 1940's.
Berlin Zoo 1930's Newsreel