Dolichonyx Oryzivorus – Bobolink

Dolichonyx Oryzivorus - Bobolink found in the US

The bobolink, Dolichonyx oryzivorus is the only member of the Dolichonyx genus. The “rice bird” name comes from its preference for cultivated grains. Hefty adult males are predominantly black, with whitish neck, lower back, and rumps. Darker wings and tails are found on adult females. During the summer, bobolinks breed throughout Northern America, with most of their range being in southern Canada. These birds are falling in numbers and are a threatened species across Canada.

Quick Overview: Dolichonyx Oryzivorus – Bobolink
Body size: Around 6.25-8 in (16-20 cm) and a weight of 48 g (1.7 oz)
Main colors: White, Yellow-brown, Black, Brown
Range: Eastern United States
Migratory Bird: No
Best time of the year to see in the U.S.: June, July, August, September
Conservation Status: Least Concern

Bobolink Description

Sex dimorphism in Bobolinks during mating season. Their black breeding plumage blends with their tall grass environment. Males have a large white patch along their backs, a buttery rear crown, and a shiny black beak. Males and females appear alike while not breeding. They have pale bills. The bills of all sexes and ages are cone-shaped. They are yellowish-brown with black stripes behind their eyes and down their backs. A stripe runs over their eyes and through their crown. These little critters have brown wings with striped tails.

Dolichonyx Oryzivorus - Bobolink found in the US
Dolichonyx Oryzivorus – Bobolink. Photo by: Scott Heron

Size

These birds have a length of 6.25-8 in (16-20 cm) and a weight of 48 g (1.7 oz). Their wings could range from 10.25-12.5 in (26-32 cm).

Feeding

Young are fed based on food availability and weather. Male bobolinks spend more time at primary females’ nests than secondary females’ nests. Nestlings are fed Lepidoptera, sawfly, and arctiid larvae, as well as mayflies. Male bobolinks consume dandelion seeds and cutworms in May. A few males start consuming cinquefoil seeds in June. Bobolinks eat on rice fields while migrating. Bobolinks are diurnal foragers that roost at night. Bobolinks hunt insects and seeds on the ground.

Habitat

Bobolinks are reedbirds since they live in grassy meadows and marshes. They nest on hay fields in the eastern and midwestern US. Wintering areas include Brazil, Uruguay, Paraguay, and northern Argentina. During migration, they pause in rice fields, earning them the moniker “rice-birds”. Nest survival is higher among ancient farms and pastures. Away from woods, these birds choose tall grassy regions to nest.

Behavior

Male bobolinks swiftly establish mating areas through singing. Their actions are tied to music. Males sing and perform aerial displays to attract mates and assure the next generation’s survival. Females conceal during nesting season. When alarmed near their nest, they often flee across the grass to distract a predator from their nestlings. Females also land some meters distant from their nests and go to them. In general, they are social and may be seen in huge flocks.

Dolichonyx Oryzivorus Scientific Classification

  • Kingdom: Animalia
  • Phylum: Chordata
  • Subphylum: Chelicerata
  • Class: Aves
  • Order: .Passeriformes
  • Family: Icteridae
  • Genus: Dolichonyx
  • Species: Dolichonyx oryzivorus

Best time of the year to see

The best time to see these birds in the United States is during the summer season (June – September).

Distribution of the Bobolink in the USA

Breeds in southern British Columbia, southern Canada, and southern New England, as well as eastern Oregon, central Colorado, central Illinois, western Virginia, and western North Carolina. During the winters, he spends time in southern South America.

The Bobolink can be found in the following states in the United States – Alabama, Alaska, Arkansas, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, New Hampshire, New Jersey, New York, North Dakota, Ohio, Oklahoma, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Vermont, Washington, West Virginia, Wisconsin and Wyoming.

Dolichonyx Oryzivorus – Bobolink

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