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Which coraciiform families are sometimes grouped with rollers?
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Coraciiform
Yellow-billed hornbill (Tockus leucomelas).
The family Coraciidae, which comprises the rollers, is sometimes considered to include the ground rollers and the cuckoo roller as subfamilies. While these groups are sometimes classified together, other taxonomic views categorize them as distinct families within the order Coraciiformes.12