An example cat activity apparatus includes: a first frame member； a second frame member, the second frame member being attached to the first frame member at an end by a hinge mechanism to form “V” shape； a first shelf member extending between the first frame member and the second frame member, the first shelf member being positioned in notches defined by the first frame member and the second frame member； and a second shelf member extending between the first frame member and the second frame member and being vertically spaced from the first shelf member, the second shelf member being positioned in notches defined by the first frame member and the second frame member.
