<font color="blue">Bob,
You can just reach down under the tractor between the rear tires and just a tad forward... if you feel something, it's most likely a boy...
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<font color="maroon">Stoney</font>
<font color="red">{Course, the downside to this method is that frequently, the tractor will follow you home with this silly little grin on it's face! <ducking>}</font>