Yes, here's info in their website about it. Sounds like it's weather permitting and is an additional fee. https://www.philadelphiazoo.org/Explore/Attractions/WildWorks-Ropes-Course.htm
They did have one, but I recommend calling them in advance. Here is a webpage discussing the zip line. https://www.google.com/amp/s/www.nbcphiladelphia.com/news/local/Philadelphia-Zoo-to-Open-34-Foot-High-Zipline-and-Rope-Course-509432871.html%3famp=y
No
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