Ohio Division of Wildlife - The Prothonotary Warbler got its name from the bright yellow robes worn by papal clerks, known as prothonotaries, in the Roman Catholic church. This one photographed recently
Weekly Bird: Prothonotary Warbler – Be Your Own Birder
Prothonotary Warbler Overview, All About Birds, Cornell Lab of Ornithology
Prothonotary Warbler | James River Association
Plumages, Molts, and Structure - Prothonotary Warbler - Protonotaria citrea - Birds of the World