Although two fawns are the norm for whitetail deer, reproductive output is tied directly to nutrition and therefore habitat conditions. In poor-quality habitats, many does may only produce single fawns. For example, in some areas where forage is limited in abundance or low in quality, conception rates as low as 1.14 fetuses per adult doe have been reported. When habitat conditions are very good, however, this ratio rises dramatically. As you would expect, it peaks in some of the agricultural regions of the Midwest. One study found the rate to be as high as 2.1 fetuses per adult doe, which would indicate that triplets are not uncommon in these areas. This certainly underscores the importance of harvesting sufficient numbers of does to prevent populations from exceeding the capacity of the range.