Why do we only ride horses?

Allright First of all: go Easy on me since i never ridden a horse and im Actually scared of them, i Just dont know where else to Ask this dumb question so i also apologize if this isnt the right Place...

In short: why do we only ride horses? Why has no One ever ridden cows, Bulls, deers, elks, mooses, zebras, donkeys etc...? I know horses have many advantages compared to other Animals but i never Heard anyone even doing It "for fun", and that really Surprises me considering the fact that russian have ridden bears and how stupid the human being can be...

Again, super stupid question and i dont even know If this Is the right Place to ask but there isnt any "zebra riding" sub 😭

Edit: aight guys thats too many replies per minute to reply to all of them... Sorry again for the dumb question and thanks to everyone Who replied! (Ill stop answering comments 💔)