A small little bird is flying fast and low above the rushing mountain stream. It perches on a rock. It looks attentive around and starts rapidly foraging small insects and aquatic prey from the wet rock surface or water. Occasionally these birds wade in the water or dip bills or heads into it.
Conspicuous only because of his white crown, nape and patch on upper back. The rest is sooty brownish black to chocolat brown. Hardly perceptible.