I already was at Plzen, and thanks to a friend I managed to see the offshow bird room. But nothing about mammals, except a pair of lesser hegdehog tenrecs kept in the same room...
In the same travel I go to Prague Terrarium that by this time had striped possum behind the scenes, but I asked the girl and she denied me to see it.
@Kakapo The offshow mammals were in the same room as the larger offshow birds (things like parrots, kookaburra and so forth) - I suspect you did have access to them but didn't see anything inside the cages at an initial glance and hence thought they were empty
No, I only saw one room. And some larger bird are in fact in these same room (a very inquisitive kea and a philippine cockatoo, also a coppery-tailed peacock-pheasant, these are the largest I remember - no kookaburra). Anyway probably a visit to the mammal section would have been worst, since I wasted all my camera battery in the bird room, so now I would be just thinking in the so many "lost chances" (animals seen but not photographed).