BTW I looked into some problematics of Horses and donkeys... How when they have 64 and 62 chromosomes can do crossbreeding, and discovered interesting stuff about a mule crossbred with horse that had something that looked exactly like horse, (but they didn't have genetic sequencing at that time thus we don't know number of chromosomes).
There was something recently, that was fertile, and it reduced number of chromosomes to lower number from two possibilities. The horse however suggest, in the fertile mule horse crossbreeding, it increased number of chromosomes to horse level. So, there is chance the chromosome difference might change in both directions.
Then I seen terror like this:
And of course I read about:
Mules.
Hinnies.
Zeedongs.
Tigons.
Wholfin.
Interspecies bred between Spinner Dolphin and Stripped Dolphin.
Liagulep.
And several people asking on Quora if they can impregnate animals...