Since its very beginning, the Saint Louis Zoo has
been a leader in exhibit design. With the world's largest
walk-through bird cage built for the World's Fair of
1904 and the open moated bear pits built in 1924, the
Zoo combined good animal care with natural settings.
In the 1902s the Primate House, Bird House and
Herpetarium were built on Historic Hill in Spanish-
style architecture, with elaborate architectural details
and open atriums filled with tropical plants. Even
simple exhibits like the woodsy Chain of Lakes or the
rocky burrows of the prairie dogs give visitors a unique
glimpse of nature.