Perhaps the most interesting dipper's nest I found was one at the celebrated Seven Falls in the south Cheyenne Cañon. On the face of the cliff by the side of the lowest fall there was a cleft, in which the nest was placed, looking like a large bunch of moss and grass. My glass brought the structure so near that I could plainly see three little heads protruding from the doorway. There were a dozen or more people about the falls at the time, who made no attempt at being quiet, and yet the parent birds flew fearlessly up to the nest with tidbits in their bills, and were greeted with loud, impatient cries from three hungry mouths, which were opened wide to receive the food. The total plunge of the stream over the Seven Falls is hundreds of feet, and yet the adult birds would toss themselves over the abyss with reckless abandon, stop themselves without apparent effort in front of their cleft, and thrust the gathered morsels into the little yellow-lined mouths. It was an aerial feat that made our heads dizzy. This pair of birds did not fly up the face of the falls in ascending to the top, as did those at Rainbow Falls, but clambered up the wall of the cliff close to the side of the roaring cataract, aiding themselves with both claws and wings. When gathering food below the falls, they would usually, in going or returning, fly in a graceful curve over the heads of their human visitors. [Illustration: _Water-Ousel_ "_Three hungry mouths, which were opened wide to receive the food_"] Although the dipper is not a web-footed bird, and is not classed by the naturalists among the aquatic fowl, but is, indeed, a genuine passerine, yet he can swim quite dexterously on the surface of the water. However, his greatest strength and skill are shown in swimming under water, where he propels himself with his wings, often to a considerable distance, either with or against the current. Sometimes he will allow the current to carry him a short distance down the stream, but he is always able to stop himself at a chosen point. "Ever and anon," says Mr. John Muir, in his attractive book on "The Mountains of California," "while searching for food in the rushing stream, he sidles out to where the too powerful current carries him off his feet; then he dexterously rises on the wing and goes gleaning again in shallower places." So it seems that our little acrobat is equal to every emergency that may arise in his adventurous life.