Common Bulbul or Red-Vented Bulbul?
Here's how to tell the difference
Common Bulbul
Red-Vented Bulbul
Common Bulbul
Pycnonotus barbatus
Also known as: Black-Eyed Bulbul, Brown Bulbul, Brown-Capped Geelgat, Common Garden Bulbul, Garden Bulbul, White-Vented Bulbul
General appearance
The common bulbul, or Pycnonotus barbatus, is a small passerine bird characterized by a compact body, short neck, and long tail. Its primary coloration is a drab brown on the wings and back, transitioning to a lighter shade on the underparts. The bird has a striking black head, complemented by a patch of yellow under its tail and a thin white eye ring.
Male vs female
Males and females of the common bulbul have very similar appearances, making them difficult to distinguish in the wild. Both have the same size and coloration, with no prominent sexual dimorphism. However, during breeding season, male bulbuls often display more aggressive and distinctive behaviors, such as competitive singing and aerial displays.
Juvenile
Juvenile common bulbuls are similar in appearance to the adults, but generally bear a softer, duller coloration. Their feather edges may also be slightly fluffier and less defined than in mature individuals. Over time, as they mature, their coloring gradually darkens to match that of adults.
Size
5.9 - 7.9 in/1.0 - 1.7 oz
There's more to learn about Common Bulbul
View full detailsRed-Vented Bulbul
Pycnonotus cafer
General appearance
The Red-vented Bulbul is a member of the bulbul family of passerines. It is easily identified by its short crest on the head and a characteristic red colour patch on the vent. They are generally around 20cm in length. Their body is primarily black with dark brown mixed in. The head, throat, and crests are black, while the middle of the belly is white.
Male vs female
Males and females appear largely similar with little sexual dimorphism. Both genders flaunt the white belly and red vent patches. Females are slightly smaller and duller than males. It is challenging to distinguish them based on appearance alone.
Juvenile
Juvenile Red-vented bulbuls resemble adults but have less distinctly colored vent patches. Their upper parts are brownish while the belly and under tail coverts are often tinged rust-brown. The head, crest, and throat are not as starkly black, but instead exhibit a mix of browns. Juveniles attain the mature plumage in about one year.
Size
7.9 - 9.1 in/1.1 - 2.1 oz
There's more to learn about Red-Vented Bulbul
View full detailsHow to tell the Common Bulbul from the Red-Vented Bulbul
Visual differences
The Common Bulbul (5.9 to 7.9 inches, 1.0 to 1.7 oz) displays a drab brown body with lighter underparts, a black head, and a yellow patch under its tail. In contrast, the Red-Vented Bulbul (7.9 to 9.1 inches, 1.1 to 2.1 oz) has a primarily black body with dark brown intermixing, a black head and throat with a distinct crest, a white belly, and a characteristic red vent patch. The Red-Vented Bulbul is slightly larger, and the crest and red vent are key visual identifiers.
Key differences and behavior
Common Bulbuls (Pycnonotus barbatus) and Red-Vented Bulbuls (Pycnonotus cafer) share similarities in diet and nesting but differ behaviorally. Common Bulbuls are energetically vocal, singing prominently from bush tops, often active and noisy, and occasionally have their nests parasitized by Jacobin cuckoos. They adapt to open woodlands and human-altered areas in Africa. In contrast, Red-Vented Bulbuls are noted for their adaptability and invasive nature, thriving in diverse environments from South Asia to urban settings globally, even where invasive. They display cunning by avoiding deterrents and form pair bonds through food offerings during courtship. Both species nest in low trees or shrubs with similar incubation periods. Diets overlap with a preference for fruits, insects, and nectar; however, Red-Vented Bulbuls are versatile foragers, employing urban resources, whereas Common Bulbuls are primarily fruit enthusiasts. This adaptability and intelligence enable Red-Vented Bulbuls to succeed in varied habitats.
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