Penguins follow their keeper at the London Zoo in anticipation of feeding in April 1931. Penguins usually eat krill, squid or fish, and they obviously trusted that the man with the cap and long stride had something good for lunch in his hands.

Three years after this photo was taken, the well-fed penguins would receive some great news not involving food. Architect Berthold Lubetkin and his company, Tecton, completed one of the zoo's most famous buildings, Penguin Pool. "Not many people, let alone birds, get to live in seminal examples of prewar Modern architecture, but penguins at the London Zoo strut around one of Lubetkin's best-known projects of the 1930's," The Times wrote in 2000. "He designed the Penguin Pool to show off the behaviors of the birds: walkways for waddling, a long pool for speedy swimming and a deep tank for diving.

The Penguin Pool cemented the reputation of Lubetkin and his company, Tecton, and garnered international attention for England's Modernist movement."