World Bird List

Species factsheet
Grey Cuckooshrike (Ceblepyris caesius)

Order: Ceblepyris caesius
Family: Cuckooshrikes (Campephagidae)

Voices can be found here (external link)
Subspecies and Distribution
Subspecie Distribution
purus se Nigeria, w Cameroon, Bioko I. and Equatorial Guinea; se Sudan and Ethiopia through e DR Congo s to nw Mozambique
caesius Zimbabwe and c Mozambique to s South Africa