A trackball comprising: a housing including a top side and a bottom side that is spaced apart from the top side, the bottom side being configured to support the housing on a support surface and having a surface that defines a plane that is parallel to the support surface; a ball partially positioned within and rotatable relative to the housing, at least a portion of the ball extending through an aperture in the top side; a user-operable plunger extending through the housing, a ball support coupled to and extending from the top side of the housing, the ball support configured to rotatably support the ball, the ball support including an aperture that selectively receives a second end of the plunger, and a biasing mechanism that biases the second end of the plunger away from the ball, characterized in that the plunger includes a first end accessible from the bottom side of the housing and the second end that selectively engages the ball, the plunger first end defining an actuating surface; wherein the plunger is movable relative to the housing such that the second end engages the ball to remove the ball from the housing; wherein the plunger is movable between a retracted position and an extended position to remove the ball from the housing, and wherein in the retracted position, the biasing mechanism biases the plunger such that the first end is seated within an opening in the bottom side, the actuating surface is flush or nearly flush with the surface of the bottom side, and the second end is positioned within or adjacent to the aperture in the ball support and spaced apart from the ball, and wherein the plunger further includes a retaining mechanism that engages a stop surface within the housing to inhibit removal of the plunger from the housing, wherein the retaining mechanism includes a hook extending from the first end of the plunger towards the second end, the hook including an engagement surface that engages the stop surface. a housing including a top side and a bottom side that is spaced apart from the top side, the bottom side being configured to support the housing on a support surface and having a surface that defines a plane that is parallel to the support surface; a ball partially positioned within and rotatable relative to the housing, at least a portion of the ball extending through an aperture in the top side; a user-operable plunger extending through the housing, a ball support coupled to and extending from the top side of the housing, the ball support configured to rotatably support the ball, the ball support including an aperture that selectively receives a second end of the plunger, and a biasing mechanism that biases the second end of the plunger away from the ball, characterized in that the plunger includes a first end accessible from the bottom side of the housing and the second end that selectively engages the ball, the plunger first end defining an actuating surface; wherein the plunger is movable relative to the housing such that the second end engages the ball to remove the ball from the housing; a ball support coupled to and extending from the top side of the housing, the ball support configured to rotatably support the ball, the ball support including an aperture that selectively receives a second end of the plunger, and a biasing mechanism that biases the second end of the plunger away from the ball, characterized in that the plunger includes a first end accessible from the bottom side of the housing and the second end that selectively engages the ball, the plunger first end defining an actuating surface; wherein the plunger is movable relative to the housing such that the second end engages the ball to remove the ball from the housing; wherein the plunger is movable between a retracted position and an extended position to remove the ball from the housing, and wherein in the retracted position, the biasing mechanism biases the plunger such that the first end is seated within an opening in the bottom side, the actuating surface is flush or nearly flush with the surface of the bottom side, and the second end is positioned within or adjacent to the aperture in the ball support and spaced apart from the ball, and wherein the plunger further includes a retaining mechanism that engages a stop surface within the housing to inhibit removal of the plunger from the housing, wherein the retaining mechanism includes a hook extending from the first end of the plunger towards the second end, the hook including an engagement surface that engages the stop surface.