King rail

The king rail (Rallus elegans) is a waterbird, the largest North American rail.

King rail
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Class: Aves
Order: Gruiformes
Family: Rallidae
Genus: Rallus
Species:
R. elegans
Binomial name
Rallus elegans
Audubon, 1834
  Breeding
  Year-round

Description
At Huntley Meadows in Virginia

Distinct features are a long bill with a slight downward curve, with adults being brown on the back and rusty-brown on the face and breast with a dark brown cap. They also have a white throat and a light belly with barred flanks. Undertail coverts are white and are displayed by the male during courtship.[2] Immature birds are covered in down,[3] with light brown on the head and darker brown on the back and wings.

This bird's call is a low repeated grunt transcribed as kek-kek-kek.[4]

Standard Measurements[5][6]
length15.5–19 in (390–480 mm)
weight290 g (10 oz)
wingspan19 in (480 mm)
wing159–177 mm (6.3–7.0 in)
tail56–72.5 mm (2.20–2.85 in)
culmen58–65.5 mm (2.28–2.58 in)
tarsus52–64 mm (2.0–2.5 in)

Distribution and habitat

This bird breeds in marshes in eastern North America. Birds along the southeastern coasts of the United States are permanent residents. Other birds migrate to the southern United States and Mexico; in Canada, they are found in southern Ontario. An adult king rail will molt completely after nesting and it becomes flightless for almost a month.[7]

Ecology

This bird is diurnal, contrasting with its smaller, nocturnal relatives.[3]

Breeding

The nest is a raised platform built with marsh vegetation and covered by a canopy. This is to hide the eggs of this bird from predators that are searching from above.[3]

The king rail interbreeds with the clapper rail (Rallus crepitans) where their ranges overlap; some researchers believe that these two birds belong to the same species.

A chick

The king rail lays a clutch of 6 to 14 pale buff eggs with brown spotting. They usually measure 41 by 30 millimetres (1.6 by 1.2 in). Both parents incubate the eggs for 21 to 23 days. When the eggs hatch, the young are covered in down and are able to leave the nest. They are not able to feed themselves, though, and thus must rely on their parents for food for up to six weeks after they hatch.[3]

Feeding

This rail forages in shallow water near cover and eats mainly aquatic insects and crustaceans. It forages by probing the mud while moving around in shallow water.[3]

The chicks are fed small arthropod prey by their parents. The prey is transferred from one parent's beak to that of the chick.[3]

Males often give food to whomever they pursue during courtship.[2][7]

Status

These birds are still common in some coastal areas, although interior populations have declined due to habitat loss.[3] In Michigan, it is considered a legally protected state endangered species, at an imperiled level. [8]

References
  1. BirdLife International (2016). "Rallus elegans". IUCN Red List of Threatened Species. 2016: e.T62155060A95190392. doi:10.2305/IUCN.UK.2016-3.RLTS.T62155060A95190392.en. Retrieved 11 November 2021.
  2. "King Rail". Guide to North American Birds. National Audubon Society. Retrieved 12 April 2023.
  3. Hauber, Mark E. (1 August 2014). The Book of Eggs: A Life-Size Guide to the Eggs of Six Hundred of the World's Bird Species. Chicago: University of Chicago Press. p. 61. ISBN 978-0-226-05781-1.
  4. Garrido, Orlando H.; Kirkconnell, Arturo (2000). Field Guide to the Birds of Cuba. Ithaca, NY: Comstock, Cornell University Press. pp. 76–77. ISBN 978-0-8014-8631-9.
  5. Godfrey, W. Earl (1966). The Birds of Canada. Ottawa: National Museum of Canada. p. 122.
  6. Sibley, David Allen (2000). The Sibley Guide to Birds. New York: Knopf. p. 153. ISBN 0-679-45122-6.
  7. "King Rail". All About Birds. Cornell University. 2023. Retrieved 19 April 2023.
  8. "Rallus elegans (King rail) - Michigan Natural Features Inventory". mnfi.anr.msu.edu. Retrieved 2021-08-20.


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