Mallard or Mottled Duck?

Here's how to tell the difference

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Mallard

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Mottled Duck

Mallard

Anas platyrhynchos

Also known as: Wild Duck

General appearance

Mallards are medium-sized dabbling ducks, often seen in and around water bodies. They have a robust body with a round head and a distinctive flat bill. They exhibit a characteristic strong, direct flight.

Male vs female

Male mallards are known for their iridescent green heads, white ring around the neck, and chestnut-brown chest, while females are mottled brown with an orange bill marked with black. Both sexes have a blue speculum bordered with white on their wings. Males lose their bright colors and resemble females during the eclipse plumage in late summer.

Juvenile

Juvenile mallards resemble adult females with their mottled brown coloration but are generally duller and lack the distinct markings. As they mature, young males slowly transition to their vibrant adult plumage. They can often be seen in flocks with adults, using wetlands and ponds for feeding.

Size

19.7 - 27.6 in/25.9 - 63.5 oz

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How to tell the Mallard from the Mottled Duck

Visual differences

Mallards (Anas platyrhynchos) display sexual dimorphism: males boast an iridescent green head, white neck ring, and chestnut-brown chest, while females are mottled brown with an orange bill marked with black. Both feature a blue speculum. In contrast, Mottled Ducks (Anas fulvigula) have uniformly mottled brown plumage with buffy edges, and both sexes share similar appearances. Males have brighter yellow bills compared to females' olive tones. Their speculum is subtle purple bordered by black. Mallards range 20-28 inches in length, while Mottled Ducks measure 20-24 inches.

Key differences and behavior

Mallards and Mottled Ducks exhibit distinct behavioral differences. Mallards are more adaptable, residing in diverse habitats like city parks, grain fields, and coastal estuaries, whereas Mottled Ducks prefer open marshes and rice fields near the coast but avoid salt marshes. Mallards form pairs in fall, with intricate male displays, while Mottled Ducks pair in August, breeding starting in January. Mottled Duck nests are typically in dense marsh growth, close to water, while Mallards choose varied sites, sometimes over a mile from water. Diets overlap, but Mallards, often seen at bird feeders, consume both plant materials and animal matter, while Mottled Ducks stick to natural foraging. Vocalization differs, with female Mallards known for quacking, contrasted by Mottled Ducks' less audibly marked presence. Mallards are larger (28-39 inches in length, 1.6-4 pounds) compared to the Mottled Duck (20-24 inches, 1.3-3.0 pounds).

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