Grey-crowned Babblers live and breed in co-operative territorial groups of two to fifteen birds (usually four to twelve). Groups normally consist of a primary breeding pair along with several non-breeding birds (sometimes groups may contain two breeding pairs or two females that both breed). Most members of the group help to build nests, with the primary female contributing the most effort. Two types of nest are built: roost-nests (usually larger and used by the whole group) and brood-nests (for the breeding females), and often old nest sites are renovated and re-used from year to year. The large domed nests are placed in a tree fork 4 m - 7 m high and are made of thick sticks with projections that make a hood and landing platform for the entrance tunnel. The nest chamber is lined with soft grass, bark, wool and feathers. The brooding female (sometimes more than one) is fed by the other group members and all help to feed the nestlings. Larger groups tend to raise more young, and two broods are usually raised per season.