|Photo credit goes to the above mentioned source.|
The second Z critter is the Zebrula, a cross between a male zebra and a female horse. Below are photos from Never Ending Story blog. Zebrula is also called Zorse, it is a zebroid, specifically the offspring of a zebra stallion and a horse mare.
I was going to include the Zemni, the blind mole rat (Spalax typhlus) which is native of Eastern Europe and Asia but I couldn't find a photo with no copyrights So I scraped the idea. Oh, before I forgot, do you know that mourning dove is also known as Zenaidura?
Source of info: crosswordsolver.org