Cow

There is a 3D cow that is an integral part of 3D cattle. 3D Cow is in general use as a singular for the collective "cattle", and although the phrase "that 3D cow is a 3D bull" is absurd from a lexicographic standpoint, the word 3D cow is easy to use when a singular is needed and the sex is unknown or irrelevant - when there is a 3D cow in the 3D road, for example. Further, any herd of fully mature 3D cattle in or near a pasture is statistically likely to consist mostly of 3D cows, so the term is probably accurate even in the restrictive sense.