This is a list of the rodents on show at Poznan New Zoo when we were there:
Black-tailed Prairie Marmot Cynomys ludovicianus
Père David's Rock Squirrel Sciurotamias davidianus
Siberian Chipmunk Tamias sibiricus
Asiatic Desert Dormouse Eliomys melanurus
Merriam's Kangaroo Rat Dipodomys merriami
Reed Vole Microtus fortis
Roborovski's Desert Hamster Phodopus roborovskii
Striped Desert Hamster Phodopus sungorus
Cactus Deermouse Peromyscus eremicus
Rock Gerbil Dipodillus campestris
Mongolian Gerbil Meriones unguiculatus
Fat Sand Rat Psammomys obesus
Common Water Rat Hydromys chrysogaster
Harvest Mouse Micromys minutus
Barbary Striped Grass Mouse Lemniscomys barbarus
Xeric Four-striped Grass Rat Rhabdomys pumilio
Long-tailed Chinchilla Chinchilla lanigera
Capybara Hydrochoerus hydrochaeris
Coruro Spalacopus cyanus
Degu Octodon degus
Not all of these were in ths house - some (such as the Capybaras) were on paddocks, and a few (such as the water rats) were in the Nocturnal House. I have a feeling the Lesser Hedgehog Tenrecs (Echinops telfairi) were in the Rodent House as well.
