The Spotted Owl (Strix occidentalis) has been studied extensively for the past two decades (Gutierrez et al. 1995). Two of the key life-history parameters estimated from this research have been clutch size and brood size. In Spotted Owls, broods of one and two are common, while broods of three are rare, and no broods of four have been reported since the turn of the century (Gutierrez et al. 1995).