River ducks are a type of waterfowl that inhabit rivers and streams. Two common species of river ducks are teals and pintails. Teals are small, dabbling ducks with short necks and rounded heads. They have a distinctive blue-green head and neck, and their wings are patterned with black and white. Pintails are larger than teals and have long, pointed tails. They have a brownish-gray body and a white breast. Both species of river ducks are found in North America, Europe, and Asia.