Voice
A dry, buzzy trill with softer ringing quality.
Subspecies
Chestnut-throated Apalis (Apalis porphyrolaema) and Kabobo Apalis (Apalis kaboboensis) (Sibley and Monroe 1990, 1993) are now lumped into Apalis porphyrolaema following Dowsett and Forbes-Watson (1993).