From 2011 to present, the Penn State Arboretum has been hosting a bird-banding program under the direction of Mr. Nick Kerlin. Two of the most common birds captured are gray catbirds and white-throated sparrows. This stud compares the number of juvenile and adult birds captured each year to assess how the populations of these species have changed through time. Results indicate there are consistently relatively more juveniles in the fall than in the spring.