Karura Forest #67: Abyssinian White-Eye
The small screw-capped plastic tube, is hidden under bark & leaves in the fork of a multi-trunked tree some 200m from the parking at Gate C (Shark's Gate) on the eastern side of the forest, and around 40m before the start of the Muhugu Trail. GPSr reception here was around 6m accuracy.
This little yellow bird can be commonly seen in busy foraging groups throughout the forest in the right habitat.
To reach the cache location: enter the forest at Shark's Gate (Entry Gate C) on Kiambu Road @ S 01 14.395 E 36 50.644. After parking your car, pay the entry fee then take trail heading due north parallel to the main road to the cache location.
See here for a detailed map of Karura & Sigiria Forests and check GC4PD3V Karura Forest #1: Intro, info & entry for background info on the forest, opening times, entry fees, etc.
The Abyssinian or white-breasted white-eye (Zosterops abyssinicus) is a small, active, gregarious passerine bird, usually found in flocks. It 
occurs from 0-1,800m asl in forest edges, open broadleaf and thorn woodland, bush, scrub, bamboos and gardens from north-east Sudan south through Eritrea, Ethiopia, northern Somalia and Kenya to north-east Tanzania - often in drier areas. See distribution map in the Gallery.
There are 6 sub-species - the one found around Nairobi is the Kikuyu white-eye Z.a. flavilateralis or kikuyuensis which is resident in extreme SW Ethiopia to E and C Kenya and E-C Tanzania. It is very common in the highland forest areas such as the Aberdare and Mt Kenya
It is 10–12 cm long. The upperparts are bright green; darker and greyer in northern races. There is a narrow white ring around the eye and a thin black line between the bill and eye. The underparts vary from pale yellow to greyish-white depending on the race.
It usually forages among branches in trees but sometimes descends to ground-level feeding mainly on aphids, other small insects, including caterpillars, fruits and nectar from flowers. The nestling diet consists only of insects.
The bird has various excitable twittering and buzzing calls - usually in foraging groups. It also has a high-pitched piping flock call, a soft clear warble and a burry descending seeu. Listen here, here (at Maasai Lodge, Nairobi) and here (at Ol Doinyo Sabuk, Machakos).