Percent occurrence of berries and invertebrates from a subsample of Humboldt marten (Martes caurina humboldtensis) scats collected in the central Oregon coast April 2015 –March 2016.

We manually sorted a random subset of marten scats (n = 35) and examined contents using a dissecting microscope because we were unable to detect berries and invertebrates using our vertebrate primers during DNA metabarcoding. We grouped samples by season (spring: March–May, fall: September–November, and winter: December–February).