Hinny
This animal gets its name from a female donkey, also known as a Jenny, and a male horse, hence the name combination of Hinny. Their size can vary but in general, these hybrids are smaller than donkeys in size.
Since horses and donkeys happen to have a different number of chromosomes, it is difficult to successfully mate the two to produce a hinny and for this reason, this is an extremely rare hybrid animal. The hinny itself also has an unusual number of chromosomes as a result, and thus also has a hard time breeding.