Heads up: Some or all of the identifications affected by
this split may have been replaced with identifications of Lophoceros. This
happens when we can't automatically assign an identification to one of the
output taxa.
Review identifications of Lophoceros fasciatus 512162
West African Pied Hornbill Lophoceros semifasciatus is split from African Pied (now Congo Pied) Hornbill L. fasciatus (Clements 2007:229)
Summary: The West African Pied Hornbill is now considered a separate species from Congo Pied Hornbill. Identification is likely to be a challenge only in south-eastern Nigeria from where hybrids are known.
Details: Originally described as separate species, the Congo Pied Lophoceros fasciatus and West African Pied Hornbill L. semifasciatus differ in bill and tail coloration characters but were found to hybridize in south-eastern Nigeria (Marchant 1953), leading to their long-time treatment as a single species. del Hoyo and Collar (2014) split semifasciatus on the basis of their morphological differences and a “probably broad zone of hybridization in SE Nigeria and SW Cameroon.” Louette (1981), however, found no intergrade specimens in Cameroon, and this together with the evidence from the ML photo archive, suggests there is no more than a narrow hybrid zone. Thus the HBW/BLI split of L. semifasciatus is agreed-upon by WGAC and followed by Clements et al. (2023) and Gill et al. (2023, IOC v.13.2).
English names: The English names adopted are the previously used group names West African Pied Hornbill vs. Congo Pied Hornbill, which aligns with HBW and BirdLife International (2022) and Gill et al. (2023, IOC v.13.2).
Clements, J. F., P. C. Rasmussen, T. S. Schulenberg, M. J. Iliff, T. A. Fredericks, J. A. Gerbracht, D. Lepage, A. Spencer, S. M. Billerman, B. L. Sullivan, and C. L. Wood. 2023. The eBird/Clements checklist of Birds of the World: v2023. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/ (Link)
Unintended disagreements occur when a parent (B) is
thinned by swapping a child (E) to another part of the
taxonomic tree, resulting in existing IDs of the parent being interpreted
as disagreements with existing IDs of the swapped child.
Identification
ID 2 of taxon E will be an unintended disagreement with ID 1 of taxon B after the taxon swap
If thinning a parent results in more than 10 unintended disagreements, you
should split the parent after swapping the child to replace existing IDs
of the parent (B) with IDs that don't disagree.
Looks fine, assuming the published range boundaries are correct in Nigeria