soosoo

from The Collaborative International Dictionary of English v.0.48

Soosoo \Soo"soo\, n. (Zool.)
   A kind of dolphin ({Platanista Gangeticus}) native of the
   river Ganges; the Gangetic dolphin. It has a long, slender,
   somewhat spatulate beak. [Written also {susu}.]
   [1913 Webster]