Olive Bulbul vs Grey-eyed Bulbul

In short

The Olive Bulbul (Iole viridescens) and Grey-eyed Bulbul (Iole propinqua) are similar in appearance but can be distinguished by eye color and subtle plumage differences. Both species inhabit similar forest environments, making vocalizations and behavior important for identification.

Identification tips

1. Eye Color: Look for the grey eyes of the Grey-eyed Bulbul. 2. Plumage Tone: Note the more olive tone in Olive Bulbul compared to the browner Grey-eyed Bulbul. 3. Vocalizations: Listen for the short, nasal calls of the Grey-eyed Bulbul. 4. Behavior: Observe shyness in Grey-eyed Bulbul, though both species share similar behaviors.

Size

Both species are similar in size, typical of bulbuls, with no significant size difference noted.

Plumage

The Olive Bulbul typically has a more olive-toned plumage, while the Grey-eyed Bulbul has a duller, more brownish appearance. The most notable difference is the eye color: Olive Bulbul has dark eyes, whereas Grey-eyed Bulbul has distinctive grey eyes.

Behaviour

Both species are often found in the middle to upper levels of forests and are frequently seen visiting fruiting and flowering trees. The Grey-eyed Bulbul is noted to be rather shy.

Habitat

Both species inhabit evergreen and mixed deciduous forests. They share similar ecological niches, often making habitat alone an unreliable distinguishing factor.

Voice

The Grey-eyed Bulbul is known for its distinctive short, nasal calls, which can be a useful identification feature in the field.