Different bird species exhibit substantial variation in flight behaviour. Flight behaviours are often associated with specific ecological niches and the unique demands that a given habitat or lifestyle imparts. One of the main ways in which niches differ is in how often a bird must use non-steady flight behaviours, such as take-off, landing, or manoeuvring. Due to the link between locomotion and morphology it follows that wing morphology should vary with the relative use of non-steady flight. We here investigated the wing morphology properties that underlay variation in flight behaviour by looking at how external and internal wing morphology relates to ecological parameters that vary in non-steady flight use. We focused on the radius and ulna for our analyses because many of the muscles that are essential for non-steady flight originate or insert on these bones. We hypothesized that the morphology of the radius and ulna varies among bird species in a pattern consistent with how often the species use non-steady flight as predicted by their ecology. We quantified variation in ulna and radius morphology using 3-dimensional geometric morphometrics and used phylogenetic comparative methods to uncover relationships among skeletal morphology, wing shape, and a suite of ecological variables that are linked to non-steady flight use. Our findings suggest that overall curvature and stoutness are major axes of variation for both radius and ulna shape. Furthermore, this morphological variation is potentially related to ecology and non-steady flight use.