Viharas were for the purpose of living, Chaityas were assemblies for the purpose of discussions. Further, Chaityas were with Stupas, Viharas did not have stupas.
In the Indus Valley Civilization, the remains of Horse bones have been found from Surkotada site. The site at Surkotada is located 160 km north- east of Bhuj, in the district of Kutch, Gujarat.