Spectacled Bulbul – subadults/immatures and juveniles

posted in: Morphology-Develop. | 0

BulbulSp-Subad imm [AmarSingh] 1

“There are many juveniles in the forest at this time. When they congregate at a fruiting ficus tree it is hard to differentiate juvenile species easily as parents are often not feeding the young.

BulbulSp-Subad imm [AmarSingh] 2

“Images at top and above are of a young Spectacled Bulbul (Pycnonotus erythropthalmos) are of a subadult/immature bird where the eye marking are adult (red iris with yellow eyelid-rims) but the bill is black with yellow at nostrils and mouth as seen in juveniles (all black in adults). The oral cavity is bright yellow-orange. The plumage is still moulting into adult plumage.

BulbulSp-jv [AmarSingh] 1

“A juvenile (above, below) which has an off-white eyelid-rims, pale pink oral cavity and no orange/yellow in bill are shown above and below. The iris in juveniles is said to be ‘light brown’ (Wells 2007) but my observations show it is a darker red-brown. Some gape is present.

BulbulSp-jv [AmarSingh] 2

“Both subadult and juvenile birds were feeding independently.”

Dato’ Dr Amar-Singh HSS
Ipoh, Perak, Malaysia
2nd August 2017

Location: Kledang-Sayong Forest Reserve, Ipoh, Perak, Malaysia
Habitat: Trail along primary jungle

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