The nilgai or blue bull is the largest Asian antelope. Please note, they are not the largest antelope in the world; the eland reserves that title. While the females are more of a tawny color, the males have a bluish-grey coloring, hence the nickname.
Their short horns lack the ring structure of many other antelope. Muscular shoulders and a thick neck make for a very stocky looking antelope. They are the second most numerous exotic in Texas, right after the axis.