What was the giraffe in the miocene era?
The way you have phrased your question doesn’t make sense – the modern giraffe didn’t exist in the Miocene. If you mean what were the modern giraffe’s ancestors that existed in the Miocene, then the most likely candidates leading to the modern giraffe include Propaleoryx, a very primitive giraffid from the Miocene that likely gave rise to several of the giraffid groups existing in the Miocene. It is believed that Paleotragus, Hunanotherium and Bohlinia, all short necked giraffids, were in the lineage leading to the modern long necked Giraffa species. However, the first Giraffa species known from the late Miocene already had a long neck, and it has been speculated the the long neck was the result of a macromutation event. Giraffe taxonomy and phylogeny is still under revision and there is a lot we don’t know.