What kind of deer does the "deer" in the Central Plains refer to?

Elk is the largest and most common deer in China ancient Central Plains. Because it is not afraid of people, it is the most likely to be hunted. It is also the most common deer species in ancient Chinese history books. Take its deer-Thirty-three years of Zuo Zhuan Xi Gong: The elk is full-Mozi loses.

Unfortunately, it is because we are not afraid that talents are almost extinct.