
Naming
Formerly, some authorities also considered the following species as species within the genus "Stelgidillas":⤷ Toro olive greenbul Two subspecies of the slender-billed greenbul are recognized:
⤷ Congo slender-billed greenbul - Strickland, 1844 — from Senegal and Guinea-Bissau to southern Sudan, western Kenya, western Tanzania, south-central Democratic Republic Congo and north-western Angola
⤷ Kikuyu slender-billed greenbul - — central Kenya
References:
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