The ornamental design for an all-terrain vehicle body, as shown and described.
FIG. 1 is a perspective view from the front and left side of an all-terrain vehicle body according to our design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a perspective view from the rear and left side thereof.
The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design while all other broken lines are directed to environmental structure and are for illustrative purposes only; all of the broken lines form no part of the claimed design.