The kinnaras pervade our literature as a beautiful people very fast on their magical feet. There is a telugu movie song which begins kinnara sani vacchindamma… a song about the tributary Kinnerasani to the Godavari, where the river is described as a beautiful lady. The name of the river literally means kinnara lady.
The kinnaras still follow the system of polyandry, as the Pandavas did. (One lady marrying all the brothers in a family for unity of the joint family.) It makes good economic sense and social sense (more so, in their context where the bride price is heavy). Re-marriage is permitted and they have a lot of social freedom. With quickly declining female to male ratio in the rest of the country, I am sure that is where we are all headed anyway.
The people of the himalayas run up mountain slopes on their toes, as a horse would. This could have given rise to the legend of horse feet and human heads for the kinnaras.