The white-backed mousebird ("Colius colius") is a large species of mousebird. The white-backed mousebird has a whistled "zwee-wewit" call. The white-backed mousebird is a frugivore which subsists on fruits, berries, leaves, seeds and nectar. The blue-naped mousebird is a fairly small to medium-sized bird, measuring 13-14 inches in length. This mousebird prefers scrubby dry habitats, such as thornveld, fynbos scrub and semi-desert.