The American dipper (Cinclus mexicanus), also known as a water ouzel, is a stocky dark grey bird with a head sometimes tinged with brown, and white feathers on the eyelids that cause the eyes to flash white as the bird blinks. It is 16.5 cm (6.5 in) long, has a wingspan of 23 cm (9.1 in),  and weighs on average 46 g (1.6 oz). It has long legs, and bobs its whole body up and down during pauses as it feeds on the bottom of fast-moving, rocky streams. It inhabits the mountainous regions of Central America and western North America from Panama to Alaska.
The American dipper was described by the English zoologist William John Swainson in 1827 and given the binomial name Cinclus mexicanus.  The type locality is Temascaltepec de González in Mexico. 
- C. m. unicolor Bonaparte, 1827 – Alaska, west Canada and west USA
- C. m. mexicanus Swainson, 1827 – north and central Mexico
- C. m. anthonyi Griscom, 1930 – southeast Mexico, southwest Guatemala, east Honduras and northwest Nicaragua
- C. m. dickermani Phillips, AR, 1966 – south Mexico
- C. m. ardesiacus Salvin, 1867 – Costa Rica and west Panama
This species, like other dippers, is equipped with an extra eyelid called a nictitating membrane that allows it to see underwater, and scales that close its nostrils when submerged. Dippers also produce more oil than most birds, which may help keep them warmer when seeking food underwater.
The song consists of high whistles or trills peee peee pijur pijur repeated a few times. Both sexes of this bird sing year round.
The American dipper is usually a permanent resident, moving slightly south or to lower elevations if necessary to find food or unfrozen water. The presence of this indicator species shows good water quality; it has vanished from some locations due to pollution or increased silt load in streams.
The American dipper defends a linear territory along streams. In most of its habits, it closely resembles its European counterpart, the white-throated dipper, Cinclus cinclus, which is also sometimes known as a Water Ouzel.
The American dipper's nest is a globe-shaped structure with a side entrance, close to water, on a rock ledge, river bank, behind a waterfall or under a bridge. The normal clutch is 2–4 white eggs, incubated solely by the female, which hatch after about 15–17 days, with another 20–25 days to fledging. The male helps to feed the young. The maximum recorded age from ring-recovery data of an American dipper is 8 years and 1 month for a bird ringed and recovered in South Dakota. 
The American dipper, previously known as the Water-Ouzel, was the favorite bird of famous naturalist John Muir. He dedicated an entire chapter in his book 'The Mountains of California' to the Ouzel stating "He is the mountain streams' own darling, the humming-bird of blooming waters, loving rocky ripple-slopes and sheets of foam as a bee loves flowers, as a lark loves sunshine and meadows. Among all the mountain birds, none has cheered me so much in my lonely wanderings, —none so unfailingly. For both in winter and summer he sings, sweetly, cheerily, independent alike of sunshine and of love, requiring no other inspiration than the stream on which he dwells. While water sings, so must he, in heat or cold, calm or storm, ever attuning his voice in sure accord; low in the drought of summer and the drought of winter, but never silent." 
- BirdLife International (2016). "Cinclus mexicanus". IUCN Red List of Threatened Species. 2016: e.T22708163A94152063. doi: 10.2305/IUCN.UK.2016-3.RLTS.T22708163A94152063.en. Retrieved 13 November 2021.
- Oiseaux.net. "Cincle d'Amérique - Cinclus mexicanus - American Dipper". www.oiseaux.net. Retrieved 2020-09-28.
- Swainson, William John (1827). "A synopsis of birds discovered in Mexico by W. Bullock F.L.S. and H.S. and Mr. William Bullock, jun". Philosophical Magazine. New series. 1: 364–370 . doi: 10.1080/14786442708674330.
- Mayr, Ernst; Greenway, James C. Jr, eds. (1960). Check-list of Birds of the World. Vol. 9. Cambridge, Massachusetts: Museum of Comparative Zoology. p. 378.
- Gill, Frank; Donsker, David, eds. (2019). "Dippers, leafbirds, flowerpeckers, sunbirds". World Bird List Version 9.1. International Ornithologists' Union. Retrieved 9 February 2019.
- "Longevity Records of North American Birds". United States Geological Survey. Retrieved 13 February 2019.
- Elliott, Charles L.; Peck, Steve (December 1980). "Dipper swallowed by trout" (PDF). Wilson Bulletin. 92 (4): 524. Archived from the original (PDF) on 2012-08-29. Retrieved 2010-07-02.
- "American Dipper or Water-Ouzel". USDA Forest Service - Boise National Forest. Retrieved 9 September 2021.
- Erlich et al. The Birder's Handbook
- Stiles and Skutch, A guide to the birds of Costa Rica ISBN 0-8014-9600-4
|Wikimedia Commons has media related to Cinclus mexicanus.|
- American Dipper - Cinclus mexicanus - USGS Patuxent Bird Identification InfoCenter
- American Dipper Species Account - Cornell Lab of Ornithology
- Stamps for United States
- The Dipper - Plain, yes, but not so ordinary
- American Dipper photo gallery VIREO
- Short radio episode The Water-Ouzel, from The Mountains of California, by John Muir 1894. California Legacy Project.
- The American Dipper and Biodiversity Conservation Alliance