Recently, we presented arguments strongly supporting a type of mixture model-actually, a mixed bonding model-for liquid water (H2O) through an analysis of its extremely precise temperature-dependent density data. This model is now applied to the densities of liquid D2O in the temperature range -20 to + 100 degrees C. It is found that the available experimental data can be fit to the reported five-decimal-point precision. As in the case of H2O, the output parameters indicate the existence of two general types of bonding characteristics in the liquid, a bulky form similar to that in ice-Ih and a dense form such as that found in ice-II. Independent support for the model is obtained from the temperature-differential X-ray scattering data of Bosio et al, on D2O.