Need credible references to the number of animals (such as rabbits,
field mice, gophers, prairie dogs, etc.) killed or mutilated per year
by farm equipment (plows, tillers, cultivators, harvesters, etc.) used
in producing crops such as soy, corn, wheat, oats, and vegetables. 
Also the number of such animals killed per year as a result of
pesticides used in producing such crops.