An apparatus includes a housing, a rotational motor situated within the housing, a vibrating mechanism, and a plurality of appendages each having an appendage base proximal to the housing and an appendage tip distal from the housing. One or more of the appendages are adapted to cause the apparatus to move across a surface in a forward direction generally defined by a longitudinal offset between the appendage base and the appendage tip, and the appendages include two or more appendages disposed such that the appendage tips of the two or more appendages are adapted to contact opposing surfaces to produce a net force in a direction generally defined by a longitudinal offset between the appendage base and the appendage tip of the two or more appendages as the vibrating mechanism causes the apparatus to vibrate. The net force can allow the apparatus to climb when the opposing surfaces are inclined.