The Collaborative International Dictionary of English v.0.48:

Saiga \Sai"ga\, n. [Russ. saika.] (Zool.)
   An antelope (Saiga Tartarica) native of the plains of
   Siberia and Eastern Russia. The male has erect annulated
   horns, and tufts of long hair beneath the eyes and ears.
   [1913 Webster]