The figure below displays a vase found at Mehrgarh a pre-Harappan site with a picture of this composite animal. Notice also the ashvattha leaves, also linking it to Vedic thought. It is a very ancient artifact from the pre-Harappan site of Mehrgarh. Here is the vase with the image along with the ashvattha leaves, which again shows the Vedic connection. In summary, the Vedic and Harappan civilizations were one.
Harappan artifacts are material representations of ideas and thoughts found in the Vedic literature.
The Harappans therefore were Vedic Harappans. The author, Dr. N.S. Rajaram is a mathematician and linguist who has written extensively on ancient India. He is currently working with Jha on the book Vedic Symbolism in Indus Seals.