Flight is fast and direct on their short wings. Most species can take nectar by hovering like a hummingbird, but usually perch to feed. Order: PasseriformesFamily: Zosteropidae  The white-eyes are small and mostly undistinguished, their plumage above being generally some dull colour like greenish-olive, but some species have a white or bright yellow throat, breast or lower parts, and several have buff flanks. As their name suggests, many species have a white ring around each eye. Order: PasseriformesFamily: Oriolidae  The Old World orioles are colourful passerine birds. They are not related to the New World orioles. There are 29 species worldwide and 4 species which occur in Cameroon. Order: PasseriformesFamily: Laniidae  Shrikes are passerine birds known for their habit of catching other birds and small animals and impaling the uneaten portions of their bodies on thorns. A typical shrike's beak is hooked, like a bird of prey. Order: PasseriformesFamily: Malaconotidae  Bushshrikes are similar in habits to shrikes, hunting insects and other small prey from a perch on a bush. Although similar in build to the shrikes, these tend to be either colourful species or largely black; some species are quite secretive. Order: PasseriformesFamily: Vangidae  The helmetshrikes are similar in build to the shrikes, but tend to be colourful species with distinctive crests or other head ornaments, such as wattles, from which they get their name. Order: PasseriformesFamily: Dicruridae  The drongos are mostly black or dark grey in colour, sometimes with metallic tints. They have long forked tails, and some Asian species have elaborate tail decorations. They have short legs and sit very upright when perched, like a shrike. They flycatch or take prey from the ground. There are 4 species which occur in Cameroon. Order: PasseriformesFamily: Corvidae  The family Corvidae includes crows, ravens, jays, choughs, magpies, treepies, nutcrackers and ground jays. Corvids are above average in size among the Passeriformes, and some of the larger species show high levels of intelligence. There are 120 species worldwide and 2 species which occur in Cameroon. Order: PasseriformesFamily: Sturnidae  Starlings are small to medium-sized passerine birds.