The GRYN Vertebrate and Vascular Plant Inventory Study Plan (2000) guided biological inventories in the parks from 2001-2005 to help document at least 90 percent of vertebrate and vascular plant species currently occurring in the parks.

Some GRYN inventory projects targeted plant and animal species of special concern, such as rare and declining species, exotic species, and other species of special management interest.

Funding from the National Park Service Natural Resource Challenge provided for the involvement of numerous experts to help establish and achieve inventory goals. Results from these recent inventories, along with prior data, are managed in the NPS Species Database. The data are currently available to park natural resource managers, and online public access is planned once federal quality control requirements are satisfied. Lists of species occurring in parks are available from the inventory categories in the navigation bar to the right.

In addition to specific vertebrate and vascular plant inventories tailored to help fill data gaps at each park, the NPS is working on service-wide Resource Inventories to ensure that basic data are consistently available for every park in the nation. The status of these 12 standard inventory themes in GRYN parks is listed to the right under NPS Resource Inventories.