The Grey Longbill (Macrosphenus concolor) is a species of Old World warbler in the Macrosphenidae family. It is found in Angola, Benin, Cameroon, Central African Republic, Republic of the Congo, Democratic Republic of the Congo, Ivory Coast, Equatorial Guinea, Gabon, Ghana, Guinea, Liberia, Nigeria, Sierra Leone, Tanzania, Togo, and Uganda. Its natural habitat is subtropical or tropical moist lowland forests.
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