On 9 October 1957 David B. Marshall (1959) collected a male Black-throated Blue Warbler Dendroica caerulescens at Malheur National Wildlife Refuge, Harney County, Oregon. The bird was taken from the group of trees at the refuge headquarters, and it represented the first Oregon record. Eugene Kridler (Kridler and Marshall, 1962) collected a second male from the same group of trees on 27 September 1960. Eugene Kridler (1965) banded a male at Malheur refuge headquarters on 24 October 1961 and recaptured it two days later in the same area. He also observed another male at headquarters on 2, 3 and 4 May 1963.