Shelleybülbül Arizelocichla masukuensis

Fairly small, dark, inconspicuous greenbul. The birds in Kenya and along the Albertine Rift have a gray crown, whereas the ones in central Tanzania and Malawi are uniformly olive-green. Found in the mid-story of montane forest. The western subspecies is known for its distinctive habit of creeping along branches like a woodpecker. Easily confused with other greenbuls, but slightly smaller and slimmer than other species in its range. Tree-creeping habits are distinctive when observed.