Mongolic languages are similar in this respect to Dravidian languages, and all Paleosiberian languages are rigidly pro-drop.
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Mongolian: a family of Altaic language spoken in Mongolia
(mongolism) a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation
(Mongolism) Down syndrome, or Down's syndrome (primarily in the United Kingdom), trisomy 21, or trisomy G, is a chromosomal disorder caused by the presence of all or part of an extra 21st chromosome. It is named after John Langdon Down, the British physician who described the syndrome in 1866. ...