World Bird List

Species factsheet
African Green Pigeon (Treron calvus)

Order: Treron calvus
Family: Pigeons, Doves (Columbidae)

Voices can be found here (external link)
Subspecies and Distribution
Subspecie Distribution
nudirostris Senegal to Guinea
sharpei Sierra Leone to n Cameroon
calvus e Nigeria to c Angola and e and s DR Congo
poensis Bioko I. (Gulf of Guinea)
virescens São Tomé and Príncipe Is. (Gulf of Guinea)
uellensis n DR Congo to s Sudan and sw Ethiopia
gibberifrons s Sudan to the Lake Victoria basin
brevicera s Ethiopia to n Tanzania
wakefieldii coastal Kenya to ne Tanzania
granti e Tanzania
salvadorii se DR Congo to w Tanzania and Mozambique
ansorgei w Angola
schalowi e Angola to ne Namibia, n Botswana and w Zimbabwe
vylderi nw Namibia
delalandii se Tanzania to South Africa