The grey warbler generally feeds on small invertebrates such as insects, spiders and Caterpillars.
They have been known to use an open style or universal nesting box.
The grey warbler prefers to nest quite close to the ground around 2 m up in shrub covered areas. Their nests are constructed using twigs, grasses, moss and spider web.
The grey warbler usually breeds twice a year beginning in September and again in November.