Brown-Headed Cowbird or Shiny Cowbird?
Here's how to tell the difference
Brown-Headed Cowbird
Shiny Cowbird
Brown-Headed Cowbird
Molothrus ater
General appearance
The brown-headed cowbird is a medium-sized bird, approximately the size of a robin or sparrow, measuring between 6-8 inches or 15-20 cm. Its wing shape is broad and the tail is either rounded or square-tipped. The bird's coloration includes hues of black, brown, green, and tan.
Male vs female
In terms of gender differences, male brown-headed cowbirds are glossy black and sport a contrasting brown head. On the other hand, females have a different appearance, with a plain dusty brown color and a darker sparrowlike bill.
Juvenile
Juvenile brown-headed cowbirds have a unique appearance that changes as they mature. Initially, they are streaked and tend to resemble female adults but their coloration grows darker as they age. Further observation is needed to note if this pattern is consistent across all seasons.
Size
6.3 - 7.9 in/1.1 - 1.8 oz
There's more to learn about Brown-Headed Cowbird
View full detailsShiny Cowbird
Molothrus bonariensis
General appearance
The shiny cowbird is a small, compact bird with a slender build and short tail. It typically measures about 18-20 cm in length. The species is characterized by a sharp, conical bill and relatively long legs, making it well-adapted for its perching lifestyle. The bird's plumage is typically glossy and has an iridescent quality, especially in good lighting.
Male vs female
Male shiny cowbirds are strikingly glossy with a deep purple to black sheen that catches the light and appears shiny. In contrast, females are less visually stunning, with duller brownish plumage that can occasionally have faint streaks; this more subdued coloration helps them blend into their surroundings. Both genders have similar body shapes, but these coloration differences are the most distinctive feature between them.
Juvenile
Juvenile shiny cowbirds resemble females but are even less glossy, with more muted brown feathers and often with streaks or speckles. Their plumage lacks the iridescent sheen seen in adults, making them harder to identify from afar. Juveniles can sometimes appear somewhat scruffy as they transition to adult plumage over successive molts.
Size
6.7 - 8.7 in/1.1 - 2.3 oz
There's more to learn about Shiny Cowbird
View full detailsHow to tell the Brown-Headed Cowbird from the Shiny Cowbird
Visual differences
The Brown-Headed Cowbird, at 6-8 inches, has a rounded or square-tipped tail. Males have a glossy black body with a contrasting brown head, while females are plain dusty brown. The Shiny Cowbird is 7-8 inches with a short tail and a slender build. Males exhibit a deep purple to black iridescent sheen, whereas females are dull brown. Brown-Headed Cowbirds feature darker sparrow-like bills, while Shiny Cowbirds have sharp, conical bills. Juveniles of both species resemble their respective adult females but with even less distinguishable plumage.
Key differences and behavior
The Brown-Headed Cowbird is commonly found in open countrysides like farms and fields, while the Shiny Cowbird thrives in semi-open areas, particularly near coastlines in North America and in tropical lowlands. Both engage in brood parasitism, relying on other bird species to incubate and rear their young. However, during mating, Brown-Headed Cowbirds use visual displays, puffing up feathers and bowing, while Shiny Cowbirds utilize vocal displays, singing and flying in circular patterns. In diet, Brown-Headed Cowbirds eat seeds and insects, especially those flushed by livestock, while the Shiny Cowbird's feeding habits in North America are less clear but likely include insects and seeds. Both species' males have distinctive displays for courtship and are not involved in chick-rearing.
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