Percent occurrence of vertebrate food items in spring, fall and winter of Humboldt martens (Martes caurina humboldtensis) in the central Oregon coast from April 2015—March 2016.

Data were based on 90 genetically confirmed marten scats collected using scent detection dog surveys (n = 30), live-trapping and from known marten rest structures (n = 60). The samples were grouped per season (spring: March–May 34 scats, fall: September–November 31 scats, and winter: December–February 25 scats). We quantified vertebrate diet composition using DNA metabarcoding.