Animals that start with Z

Z closes the alphabet, and the zebra’s stripes have taken a long time to explain. Camouflage, heat control and social signaling were all proposed, and none held up well. The best-supported answer is now biting flies: experiments fitting striped coats to horses show that tabanid flies fail to land properly on stripes, and zebras live where those flies carry serious disease.

7 animals in the library start with Z, from the zebra to the zorse. Most of them live in Africa and Asia.