BIRDS
There were originally 7 of these Japanese-style aviaries, constructed in 1875. In 1974 6 of them were demolished with the 7th being preserved as a memorial to Martha, the last known passenger pigeon.
Eagle
cage
Aquila (eagle)
Trained
Eagle and owner
Betsy Ross and Brookfield Baldy, the pair of Bald Eagles at the zoo, produced an eaglet which was later released in the wild. The release was part of a program aimed at increasing the population of the endangered species.

White
Peacock
RP of Storks on
nest
You name them
ELEPHANTS
Many of these early cards show a female Asian elephant named "Hatnee" who was a favorite of zoo visitors for decades. She frequently gave rides to children while being led by her trainer, Ed Coyne. Ed started at the zoo when he was 10 years old in 1877 and was still working there 65 years later when he died in 1942. He is seen standing on the leg of the elephant in the 1st non-postcard image below, and standing in front of the Asian elephant in the other.

Zoo Keeper Ed Coyne around 1915