Bioko Speirops
Zosterops brunneus
In the field, appears overall chocolate-brown with a slightly long blue-gray bill and blue-gray legs. Plumage is paler on the flanks and vent and darker near the face. Endemic to the island of Bioko, where it is found almost exclusively in the alpine zone at the top of Pico Basilé. Calls include rapid, short “peeps” and “siks” as well as longer churring notes.
Taxonomy
- Scientific name
- Zosterops brunneus
- Authority
- (Salvadori, 1903)
- Order
- Passeriformes
- Family
- Zosteropidae
- Genus
- Zosterops
Range and habitat
- Migration
- Resident species
Conservation
- Population trend
- stable
Photos
Distribution
Other Birds

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Centropus superciliosus
A large, robust, ungainly cuckoo with rufous wings and a long, broad tail. Shows a solid dark cap and back of the head, and white underparts. Unlike other coucals, shows an obviously barred rump and upper tail coverts. It often moves clumsily, preferring to clamber about in rank vegetation or walk on the ground foraging for insects or small vertebrates. Its flight is labored and heavy. This species uses a wide variety of habitats with a thick understory, including savanna, woodland, forest edge, and wetlands. The song is a deep descending bubbling series, “bu-bu-bu bu bu bu bu”, that falls and then rises in pitch.

Velvety Manakin
Lepidothrix velutina
Small, short-tailed bird found in lowland and foothill rainforest. Male is easy to identify with his glossy black body and azure crown. Female is mostly lime green with a yellowish belly; her plumage is much greener than other similar species such as Choco Manakin and female Red-capped Manakin. Most common call is a short, ringing trill. Male’s display song is a buzzy “purwit!”. Usually seen at lower to middle levels in the forest, plucking berries from fruiting trees. Formerly called Blue-crowned Manakin before that species was split. Velvety Manakin’s range includes Costa Rica, Panama, western Colombia, and northwestern Ecuador.

Knobbed Hornbill
Rhyticeros cassidix
A huge black hornbill with a prominent knob on the bill, conspicuous red “gills” on the sides of the beak, a turquoise-blue throat pouch, and a white tail. Males have a red casque and rufous neck, females a yellow knob and black neck. Juveniles resemble male, but with an entirely yellow casqueless bill. Found in pairs or groups in canopy of forested and wooded areas of lowlands and hills. Larger and more colorful than Sulawesi Hornbill. Gives powerful, short “krok” notes and a more drawn-out “oooo-aa-ooo-aaa.”
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