Of course. And I don't think that I necessarily agree that gibbons warrant inclusion into the popular definition of "ape" simply because they lack a tail. Although they are brachiating primates. This is what makes classification of life so difficult. There is no clear differentiation point between anything in life. What's a gene? What's an organism? What's life?
I often wonder how different the human world would be today if we weren't separated from our nearest extant species by more than 4 million years. That is one of the only things that makes us unique genetically.