Races sometimes treated as two separate species owing to far larger size of nominate (allow 3); but no other differences noted except perhaps that nominate is more vocal, at least than birds in Gabon#R; comparative study of vocalizations needed. Much local overlap in size prevents dividing mainland birds into more than one subspecies: birds E & S from Cameroon sometimes separated as intermedius; birds of Upper Guinea previously separated as harterti; name hartlaubii, with type locality of Bioko, thus variously applied to groups of W or E, or, as here, to all mainland populations; proposed race leoninus (Sierra Leone) included in hartlaubii. Two subspecies currently recognized.
Food and feeding
Status and conservation
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