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 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.
- 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.
Distribution and habitat
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.
- BirdLife International (2012). "Cinclus mexicanus". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
- 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 .
- Mayr, Ernst; Greenway, James C. Jr, eds. (1960). Check-list of Birds of the World. Volume 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.
- 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