Alter the shrub is the name of a type of tribal Pycnonotidae warbler. This bird is also known by other names: mancrang. Scientific name is Pycnonotus plumosus Blyth, 1845. While in English called Olive-winged Bulbul, according to the color of their wings.

Medium-sized birds, total body length (measured from tip of beak to tip of tail) of about 20 cm.

The upper side blackish or brownish gray, backs and wings covered with green olives. The chin and throat white or whitish. Whitish gray chest, lower chest and abdomen covered with green olives. Brownish yellow rump cover.

Iris dark red brown, brownish black beak and feet.

Alter the undergrowth like the edge of the forest and dense forests. Alone or in pairs, these birds exploring the middle or upper layers of the forest canopy. Hunt for various insects and worms, as well as search for soft fruits, such as figs to eat.

Spread in the Malay Peninsula, Sumatra, Java, Borneo and Palawan. In Sumatra and Borneo, this bird is commonly found in lowland forests up to an altitude of 300 m above sea level; The Java up to an altitude of 800 m.

Cup-shaped nest is made of grass, leaves and fine twigs, placed on a bush or shrub. Eggs two eggs, speckled reddish jambuan.

In Java, this bird is often referred to as cotton bird shot.

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