Sunflower seed preference among wild birds: Gray-striped or black oil?

Bird feeders are a popular hobby across the United States, resulting in the widespread availability of commercial feeder seeds. While many previous studies have focused on factors that influence wild bird seed selection, few have focused on commonly used seeds at feeder stations run by hobbyists and which seeds are best for causal feeding stations. This study aims to determine seed preference among wild birds for two common seed types: black oil sunflower seeds and gray striped sunflower seeds. Using an infrared game camera at an established feeding station in Stillwater, Oklahoma, USA, we gathered data on bird seed selection. Seeds were offered in equal availability using trays along a brick wall, their location being reversed each day with respect to the camera. Data analysis was conducted using Jacobs' D-index. Overall, birds displayed a clear preference for black oil sunflower seeds (D=0.50) and avoidance of gray striped sunflower seeds (D=-0.50). In addition, two mammal species (Fox Squirrel and Raccoon) also showed a high preference for black oil seeds. This research can help beginner bird feeding hobbyists determine which basic seed type is best for meeting their needs