Common Bulbul or White-Spectacled Bulbul?
Here's how to tell the difference
Common Bulbul
White-Spectacled 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 detailsWhite-Spectacled Bulbul
Pycnonotus xanthopygos
General appearance
The white-spectacled bulbul, also known as the yellow-vented bulbul, has a sleek body, average length of 20 centimeters and a wingspan between 20-25 centimeters. It has a black crest, a white spectacled ring around its eyes, and a black stripe across its white cheeks. Its body is mainly greyish-brown with a yellow vent under the tail, thus deriving its other common name. Seasonal changes do not significantly affect its appearance.
Male vs female
Both the males and females of this species exhibit similar physical traits and colorations, making it challenging to distinguish between them based purely on visual characteristics. Their differences mainly exist in their vocalizations, with males having a wider variety of calls for attracting mates.
Juvenile
Juvenile white-spectacled bulbuls lack the pronounced specs and crest of the adults, and have a duller, more uniform brown coloration. The spectalces and crest develop progressively with growth. Therefore, if you spot a bulbul without distinct spectacles, it's likely a juvenile.
Size
7.9 - 9.8 in/1.1 - 1.6 oz
There's more to learn about White-Spectacled Bulbul
View full detailsHow to tell the Common Bulbul from the White-Spectacled Bulbul
Visual differences
The Common Bulbul (6-8 inches) is smaller than the White-Spectacled Bulbul (8-10 inches). Common Bulbuls have a drab brown body with a striking black head and a thin white eye ring, while White-Spectacled Bulbuls feature a greyish-brown body with a black crest, white eye spectacles, and a black stripe across white cheeks. Both species share a yellow patch under the tail. The beak shape is similar, but Common Bulbuls are slightly more compact with a shorter neck.
Key differences and behavior
The Common Bulbul (Pycnonotus barbatus) and White-Spectacled Bulbul (Pycnonotus xanthopygos) exhibit distinct behaviors and preferences despite similar diets of fruits, nectar, and insects. Common Bulbuls are gregarious, singing prominently atop bushes to attract mates and ward off competition. In contrast, White-Spectacled Bulbuls, gregarious and often found in sibling pairs, exhibit exploratory behaviors post-fledging. Both species nest in shrubs and small trees, but White-Spectacled Bulbuls lay slightly larger clutches and inhabit a broader range, including semi-arid areas. Common Bulbuls thrive across Sub-Saharan Africa in open woodlands, while White-Spectacled Bulbuls are native to the Middle East and North Africa. Both share cooperative parenting, though cuckoo brood parasitism is noted in Common Bulbuls.
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