The Collaborative International Dictionary of English v.0.48:
Water ousel \Wa"ter ou"sel\, Water ouzel \Wa"ter ou"zel\ .
Any one of several species of small insessorial birds of the
genus Cinclus (or Hydrobates), especially the European
water ousel (Cinclus aquaticus), and the American water
ousel (Cinclus Mexicanus). These birds live about the
water, and are in the habit of walking on the bottom of
streams beneath the water in search of food.