The koloa maoli (koloa, Hawaiian duck, Anas wyvilliana), locally known as koloa, was federally listed as endangered in 1967 and has the highest recovery priority among the four endangered waterbirds that occur on the main Hawaiian Islands (USFWS 2011). To successfully recover the endangered koloa which only exists on Kaua'i (Malachowski 2020), it is imperative to manage the feral mallard (A. platyrhynhos) and koloa x feral mallard hybrid populations that now constitute all populations outside Kaua'i. Rather than attempting to rid islands of these populations that is often socially difficult, we propose to artificially move the genetic ancestry of these populations back to koloa through model-guided supplementation and removal efforts. Specifically, we propose an applied research project in which we will implement simulated and optimized management strategies from a recently develop R program, 'simRestore' (Hernandez et al. in review) that couples genetic and ecological data to simulate expected ancestry changes given a particular management strategy (Priority 1, Action Number 2.1.1; USFWS 2011). Although we propose to interbreed genetically pure koloa that are ESA protected into a koloa x feral mallard hybrid population, koloa will continue to have reduced resiliency and repetition by remaining on a single island, while still being threatened by genetic extinction due to hybridization with feral mallards if this Recovery Plan Priority 1 action is not implemented.