The successful management of large herbivores requires the monitoring of a set of indicators of ecological change describing animal performance, relative animal abundance, and ungulate impact on habitat. Wild boar populations increases have been spectacular in many countries including France. Wild boars can have a substantial environmental impact on many ecosystem components including birds, but indicators to monitor such impact are currently lacking. In this paper, we examined the usefulness of monitoring the wild boar foraging traces made during their rooting activity to evaluate their impact on ground nesting birds, and developed a simple indicator of kilometric foraging (Ikf) traces found on transects. This study measured the effect of wild boar on bird abundances, controlling for vegetation characteristics (shrub density, time since last clear-cut). Using standardized spot-counts, we found that ground nesting bird abundances were negatively correlated to IkF. Our results showed a significant decrease of 44,7% in ground nesting bird abundances in areas strongly foraged by wild boars. By contrast, abundances of birds depending of ground or tree for food resource, but nesting out of reach of wild boars, were not correlated to foraging traces. We thus conclude that IkF is a simple and suitable indicator that can be used at large scales to monitor wild boar impact on ground nesting birds.