Birds that are active in the winter must continually meet their metabolic needs to survive many months of cold temperatures. Overwintering insects inhabiting trees provide an important food source for these birds. The objective of this study was to test whether or not winter birds present in the deciduous forest surrounding the Saint Francis University campus would forage more on tree-dwelling insects if there was a supplemental food source provided in the area. We used frozen mealworms placed in trees as surrogate overwintering insects and measured the foraging success of birds on these insects during a three-week period in the winter of 2014. Mealworm predation was compared across three sites differing in supplemented food sources: sunflower seeds, suet, and no provided food (control). Each site had four mealworms placed in holes drilled in 16 surrounding trees for a total of 64 mealworms per site. The consumption of these mealworms was measured during the experiment to analyze whether provided food sources influence the foraging behavior of birds in the winter. Observations after three weeks indicated that the predation rates were 78%, 72% and 69% at the seed, control and suet sites, respectively. The bird counts reveal a greater number of birds visiting the suet site compared to the control and the seed site. Birds appear to prey on insects inhabiting trees independently of foraging on supplemental food sources, or perhaps different species of birds forage on tree insects compared to those that visit feeders.