What is the offspring of a male horse and a female donkey called?

I wonder if I I'll ever have another chance to use this information?

Well she kinda looks like her daddy in the face. But that back end is definitely her mama.

To call a person hinny is a term of endearment in the Geordie dialect and is still used to this day. I know this because I grew up there. Fabulous place (Newcastle). Very friendly people.