At this point I think all of them, and because they recently opened the new trail for them you never know which species will be seen in which exhibit (but I have not visited the zoo since they trail was opened, so this info is based on the stuff I read). Before the trail was opened, lions and tigers were always in their exhibits, but leopards, pumas, jaguars, and snow-leopards were rotated between 3 exhibits.
And one other question. I was looking at the zoo map and I saw that, next to the Small Mammal House, there's a small building called "The Solitude House". What is that? ~Thylo
This does not contain any animals. I seem to remember that it is a historical building that was there before the zoo was even founded.
Black Footed Cat triplets born in April to Ascari and Aza, are now on display. Rhaegal, Viseron, and Drogon are the first of their kind born at the zoo. Cute Black-Footed Kittens Born at the Philadelphia Zoo | NBC 10 Philadelphia
So I visited the zoo the other day and had a great time! I've posted my experience and my thoughts here: Thylo's Philadelphia Zoo Review! ยป United States ~Thylo
A worker died Sep 29th after being pinned under a heavy duty golf cart. Worker Dies After Being Pinned Under Golf Cart At Philadelphia Zoo CBS Philly
I recently emailed the zoo in order to find out some information, and in it they mentioned that the zoo's last Common 'Amakihi has died over the summer. ~Thylo
The full lion pride is on display together now. Four new lion cubs join father in "pride" at Philadelphia zoo - The Morning Call