Both Tierpark and especially Zoo have lots of indoor areas and open stables, so I would say they are good places to go over winter too. Also a good amount of cold tolerant species in both parks. I imagine the Himalaya area of Tierpark probably feels more immersive in the winter.Related to this but still off topic, is it worth to visit a Zoo in Winter? Im currently planning a couple day trip to Berlin to visit both its zoos aswell as the Natural History Museum. Kinda unsure if thats really all that cool to do in Winter, or if i should Just wait till spring