Hi,
I'm searching for a way to simulate crowds of 4 legged animals, something like herds of zebras or buffalos or elephants. Is this possible with Houdini crowds? I only see humanoid sims wherever I search.

Yes, it is possible. The main place where you run into anything quadruped specific is for setting up foot planting / terrain adaptation
For example, https://www.sidefx.com/tutorials/advanced-crowds-quadrupeds-dynamics-and-how-to-work-with-problematic-assets/ [www.sidefx.com]

Thanks a lot! This will help.