I don't want to second-guess your identification, but this looks a lot like one of the Spiny Mouse species (its muzzle is longer than the typical gerbil). Is it possible that the names got switched on two photographs; or maybe the exhibit was mislabeled. It's also possible that I'm wrong - I'm not a mammologist after all! Thank you, and I appreciate all of the photos that you've posted from the Poznan Zoo!
