American marten (Martes americana) and fisher (Martes pennanti) were extirpated from the Lower Peninsula of Michigan during the turn of the 20th Century, due to over-trapping and loss of habitat. In the mid-1980s two small populations of marten were reintroduced into the Northern Lower Peninsula, in the Manistee National Forest (MNF) and Pigeon River State Forest (PRSF). Fisher was not introduced into the Lower Peninsula. This project will continue to build on our findings from our 2017 marten hair snare study. In our intitial mitochondrial DNA analyses of hair samples collected during 2017, we confirmed that eight of these samples came from fisher. Therefore, in addition to continued hair snare sampling for marten, we will be expanding our research to include fisher. Our objective is to use hair snares to detect fisher presence throughout the Northern Lower Peninsula. We will also continue to collect marten hair samples in order to, 1) estimate marten population and distribution for the PRSF population, 2) evaluate genetic diversity within the PRSF population, and 3) compare genetic diversity to the MNF population in order to determine if dispersal exists between these two populations.