The mean clutch size in our study was slightly larger than described by Wiley and Wiley ( 1981 ), but similar to other Buteo species in the tropics (see Table 5 ; Newton 2013 ). Avian clutch sizes are thought to be limited by food availability and/or predation pressures (Lack 1947 , 1948 , Skutch 1967 ). Food limitation was found to be a main factor limiting clutch size in Savanna Hawk Buteogallus meridonalis (Mader 1982 ). Relatively low non-human predation pressures (this study), and an adequate food supply (Woolaver et al. 2013b ) may have potentially selected for 3-egg clutches in Ridgway’s Hawk. Brood size and length of the nestling period for Ridgway’s Hawk varied somewhat from the larger island Buteo species ( Table 5 ), but was consistent with other similar-size tropical Buteo species.