The winter quarters were constructed in 1895 to provide warmer climates for some species during the winter months. Elephants for example.

Aquarium East
Wing Aquarium
Piranha

They had a lot of different rides years ago. (See elephants)
Some of the paying customers
Boat
rides
The pony track seen above was a popular attraction for many decades. It was located west of today's Insectarium and Nocturnal House. The gondolas seen in the last card above were used on the zoo lake in 1889 for a musical performance, Scenes from Venice, with a "cast of hundreds" A huge canvas backdrop that was painted by Cincinnati artists Henry Farny and John Rettig was used. The 1900 postcard view in the 4th card shows the boats being used to ferry visitors around the lake. They were only used for a brief time.

A group of College Girls
Safari Train
A rare card titled: Don't be balky!

A general
view
These ladies don't seem too happy
Children's Zoo
to be hanging up-side down.
First opened in 1938
MULTIPLE ANIMAL GREETING CARDS
The second and third cards above shows a sacred cow. This is not a misprint, up till 1952, when it was eliminated, there was a Camel and Sacred Cow House.
You would think someone would have known the difference between a Hippo. and an Elk (Wapiti) in the last card above.
These 8 cards will also be seen on the Sets page
HIPPOPOTAMUS
"Zee-koe" the young hippo seen in the first card (and probably the 2nd one also) above was not only one of the most popular animals in the early 1900s, but was also one of the most valuable. He was acquired from Germany for $3,000. He died in 1923 after swallowing a ball and was mounted and displayed at Chicago's Field Museum of Natural History.
Julia & her son Gigi in 1933. Photo by Paul Briol
SEA LIONS-SEALS-PENGUINS
WALRUS
GIRAFFES
The first two cards above show the first giraffe born in this country that lived to maturity. The male giraffe was named Kermit and the female was named Alice, they were named after President Teddy Roosevelt's children. When the baby giraffe was 8 months old, Alice died of fright. It appears that she was terrified of thunderstorms and would freeze in place and tremble all over. The 3rd card above shows the moving of a giraffe in 1906 for the opening of the new elephant house. The heavily padded walls of this wagon was pulled by six horses.
RACCOON
KOALA