larger natural areas in adjacent public parks, including those in and around the Sparrow Pond wetland, Brandymore Castle and Four Mile Run in Arlington, Piney Branch and Difficult Run in Fairfax County, and the confluence of Goose Creek and Sycolin Creek in Loudoun County. Park interpreters, local teachers, environmental groups and amateur naturalists use the park as a resource for plant and animal study. These groups have identified approximately 450 species of wildflowers and more than 100 species of birds in the park. Wildlife in the park includes mammals such as foxes, river otters and beavers, and reptiles such as turtles and snakes. A variety of hawks and owls and other resident, non-resident and migratory birds, both upland and aquatic, find habitat in the park. Transmission lines The W&OD Trail lies beneath a set of electric power transmission lines between its trailhead and the Dominion Virginia Power's Pleasant View Substation in Loudoun County southeast of Leesburg. The power company removes trees along this section of the trail to protect its lines, at times eliciting protests from members of the public and elected officials in the impacted jurisdictions. Trees shade much of the remainder of the trail. In 2004, Dominion Virginia Power announced plans to extend its transmission lines in Loudoun County above ground from the Pleasant View Substation northwestward along the route of the W&OD Trail. In response, on November 15, 2005, the Loudoun County Board of Supervisors unanimously adopted a resolution of continued opposition to the installation of the proposed transmission lines along the Trail. Citing the impending loss of trees along its trail, the NVRPA asked the public on December 13, 2005, to oppose Dominion Virginia Power's application for the transmission line project in hearings that the State Corporation Commission (SCC) was planning to conduct as part of its review of the project. During 2005, 2006 and 2007, the NVRPA submitted testimony and briefs to the SCC that opposed the construction of transmission lines along the route of the trail. In January 2007, an SCC hearing examiner recommended the construction of an overhead transmission line that would follow a wooded segment of the W&OD Trail between Leesburg and Clark's Gap. After the SCC ordered the examiner to consider construction of an underground line along that segment of the trail, the Loudoun County Board of Supervisors unanimously adopted on June 5, 2007, a resolution that supported the location of