We got the second one to occupy the other one and keep him out of trouble. For the most part it works
They are climbers and since they do not really shed and have no doggy odor they are allowed on furniture (like we could stop them). They like to sleep in your lap like a cat.
I have seen pictures of ones that climb trees and chain link fences.
They also run sideways on the couch, like a Nascar going around a banked turn. They are not hyper dogs either. They usually spend most their time sleeping, it's either on or off for them. They are thinking dogs so they need to be occupied by something or they will find something to occupy them.
Funny but they are actually better behaved when we are gone. They usually just sleep. They save the naughtiness for when I am home.
Long walks usually make them happy-a tired basenji is a happy owner.