water ousel

from the GNU version of the Collaborative International Dictionary of English.

• (Zoöl.) 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.