I had wondered too originally
& my poor family didn't have the wit you guys have!
Tell me about bunnies - because my son keeps pestering me to get one - told him that after I did some research on them they:
1) really are happier with a pal (& that is not always successful - same with all creatures).
2) I remember from my farm days that their poop is similar to sheep's - strong smelling.
3) I didn't want to rewire all the electrial cords!.