The Collaborative International Dictionary of English v.0.48:

Zamouse \Za*mouse"\, n. [From a native name.] (Zool.)
   A West African buffalo (Bubalus brachyceros) having short
   horns depressed at the base, and large ears fringed
   internally with three rows of long hairs. It is destitute of
   a dewlap. Called also short-horned buffalo, and bush cow.
   [1913 Webster]