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Major Events In Zoo History
| Zoological Society of Philadelphia established |
March 21, 1859 |
| Philadelphia Zoo grand opening |
July 1, 1874 |
| First-of-its-kind animal health laboratory established at Zoo |
1901 |
| Bird House opens |
1916 |
| First successful birth of an orangutan in a U.S. zoo |
1928 |
| Zoo wired for electricity |
1928 |
| First successful birth of a chimpanzee in U.S. zoo |
1928 |
| Leo, the MGM lion, retires to the Zoo after a 15-year movie career |
March 1931 |
| Zoo develops first scientifically controlled diets, “zoocake” |
1935 |
| First Children's Zoo in the western hemisphere opens |
1938 |
| New Elephant House opens |
1941 |
Zoo discovered that a carrot juice flamingo diet helped flamingos retain their pink color
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1948 |
| Carnivora House opens |
1951 |
| Bird Valley opens |
1954 |
| First cheetahs born in a zoo |
1956 |
| New Children's Zoo opens |
1957 |
| Centennial of the Zoological Society of Philadelphia |
1959 |
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