There aren't many common animals that start with the letter "Z". Here are a few possibilities:

* Zebra: This is the most common and well-known animal starting with "Z".

* Zooplankton: This refers to a diverse group of tiny aquatic animals that drift in water.

* Zorse: This is a hybrid animal, a cross between a zebra and a horse.

Let me know if you're looking for something more specific!