Mottled Duck

The Mottled duck, belonging to genus Anas, is a medium-sized, non-migratory dabbling duck. This species is often confused with the American black duck.

Mottled duck

Mottled duck

 

 

Scientific classification of Mottled Duck

Kingdom: Animalia

Phylum: Chordata

Class: Aves

Order: Anseriformes

Family: Anatidae

Genus: Anas

Species: A. fulvigula

 

Scientific Name for Mottled Duck

The scientific name for Mottled duck is Anas fulvigula.

 

Subspecies of Mottled Duck

It has two recognized subspecies –

  • F. Fulvigula
  • F. Maculosa

Physical description of Mottled Duck

The length of an adult Mottled duck stands between 43 to 62 centimetres, with a wingspan of 240 to 270 centimetres.

Physical description of Mottled duck

Physical description of Mottled duck

Their average weight is 1.2 kilograms. Both hens and drakes have similar brown colored plumage, with hen carrying lighter shade. In both sexes, the color of the neck and head tend to be a bit lighter compared to its body color shade. Drakes tend to be a little larger than the hens. Another distinguishable feature is drakes’ bright yellow bill compared to hens’ pale orange bill. In some individuals, bills can be lined with black patches near the base and around the edges. Both male and female possess greenish blue speculum (which does not have a white border like the mallards).

 

Mottled Duck Habitat

In Florida, this species is commonly seen around flooded marshes, wet prairies, ditches and freshwater wetlands. They are occasionally seen in rice fields or flooded fallow fields. The Louisiana and Texas population are generally found in brackish ponds, freshwater lakes and saltwater marshes with dense vegetation nearby.

 

Habitat of Mottled duck

The habitat of Mottled duck

The geographical range of Mottled Duck

The Mottled ducks are year-round residents of North America. They inhabit Louisiana, southern Texas, Florida (from Cape Sable to Alachua County). The scattered population are also found in the Mississippi coastal regions, Alabama, the Gulf of Mexico and Vera Cruz, Mexico.

 

Behaviour and Adaptation of Mottled Duck

Mottled ducks are strong swimmers. They walk on land with a clumsy swaying motion. They have deep, strong wing beats that result in slow flight. They feed by plucking food from the water surface, or from a little below the surface by submerging its head and tipping its tail up towards the sky. Males are more confrontational when it comes to defending their territory. Defensive behaviour includes biting, chasing and inviting. During breeding season, pursuit flights and extra-pair copulation battles are common. Adults fly away when approached by a predator. Ducklings or moulting adults, who are not able to fly, have a tendency to dive under the water. Breeding hens are very protective of its broods and it emits a loud quack warning if it sees an intruder in its territory.

 

 

Reproduction of Mottled Duck

Breeding pairs are mostly formed in November. Copulation begins in January and goes on till July. Courtship displays include various types of stylized movements, preening behind wing, along with different types of whistles, burping sounds and grunts. Nest, which is a shallow bowl lined with grasses and breast feathers, is made in dense vegetation in a prairie, marsh, agricultural land or canal bank.

Reproduction of Mottled duck

Reproduction of Mottled duck

Females lay 5 to 13 eggs that of a pale olive color. Incubation, which goes on for 24 to 28 days, is only done by the hen. Juveniles can leave the nest just after hatching if led by their mother. They are also able to feed on their own at the feeding sites. The juveniles can take sustained flight when they are 60 or 70 days old.

 

Mottled Duck Diet

Mottled Ducks feed on various types of animal and plant matters that vary by season and region. They primarily consume shoots and seeds of several kinds of grass, smartweed, wild millet, bulrush, widgeon grass, sea purslane and spikerush. In the western part of its range, they feed on cultivated rice. Breeding females and juveniles mostly feed on invertebrates including beetles, midges, dragonflies, amphipods, crayfish and snails.

Mottled Duck Video

Life expectancy of Mottled Duck

These species have a relatively short lifespan. In the wild, they live for somewhere between 2 to 5 years. Their yearly mortality rate is 50%.

 

Vocalization of Mottled Duck

Their calls are similar to those of a mallard. Males emit a raspy, low ‘raeb’ sound. Two notes signify courtship call, while single call signifies alarm signal. Females make quack sounds when they are alerted, and produce a short ‘gaaggg’ note when looking for a mate.

 

Predators of Mottled Duck

Eggs, nesting females, juveniles and adults that are going through moulting are vulnerable to predators like Gray fox, Red fox, Raccoons, Ground squirrels, American mink, River otters, Peregrine falcons and Northern harriers among others.

 

Conservation Status of Mottled Duck

The IUCN Red List of Threatened Species has kept Mottled duck in the ‘Least concern’ category. However, development in urban and suburban areas poses a great threat to its survival.

 

Interesting Facts about Mottled Duck

  • Its hybridization with mallards poses a great threat to the future of Mottled duck.
  • North American Breeding Bird Survey suggested that the population of this species has declined by 3.1 per cent each year from 1966 to 2015.
  • As per Partners in Flight, their present worldwide breeding population is 460000.
  • In some of its native range, Mottled duck is a popular game bird. And, in recent years, hunters have taken down 20000 to 50000 individuals.
  • In several dabbling ducks, breeding pair breaks up when female lay eggs. However, in the case of Mottled ducks, male stay with their mate till the incubation period.
  • The longest known lifespan of an individual was thirteen years and seven months when it was shot in the state of Florida, US.

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