Dr. Chapman (1907) writes of this bird in its haunts: The charm of its haunts and the beauty of its plumage combine to render the Prothonotary Warbler among the most attractive members of the family. I clearly recall my own first meeting with it in the Suwanee River region of Florida. Quietly paddling my canoe along one of the many enchanting, and, I was then quite willing to believe, enchanted streams which flowed through the forests into the main river, this glowing bit of bird-life gleamed like a torch in the night. No neck-straining examination with opera-glass pointed to the tree-tops, was required to determine his identity, as, flitting from bush to bush along the river's bank, his golden plumes were displayed as though for my special benefit. Dr. Lawrence H. Walkinshaw (1938) says that the golden swamp warbler "nests rather abundantly along southwestern-Michigan rivers. * * * Winding streams, bordered densely with oak, maple, ash, and elm, shallow ponds with groups of protruding willows and flooded, heavily shaded bottom-lands are favorite nesting habitats for the Prothonotary Warbler (_Protonotaria citrea_). Such habitats occur along the banks of the Kalamazoo River and its tributary the Battle Creek River in Calhoun County, Michigan." _Territory._--The males arrive on the breeding grounds a few days or a week before the females come and immediately try to establish their territories, select the nesting sites, and even build nests. Dr. Walkinshaw (1941) writes: The Prothonotary Warbler is a very strongly territorial species. When a male takes possession of a certain area he continually drives off all opponents if he is able. At certain areas in Michigan I have watched these birds battle intermittently for two or three days, usually for the same bird house, one male finally taking possession. In addition I have observed them to drive off House Wrens (_Troglodytes aedon_), Black-capped Chickadees (_Penthestes atricapillus_) and Yellow Warblers (_Dendroica aestiva_). * * * The male Prothonotary Warbler selects the territory, selecting the nesting site before he becomes mated for the first nest, but thereafter both birds inspect the new nest sites. On observations made near Knoxville, Tenn., Henry Meyer and Ruth Reed Nevius (1943) found that--