Grand Teton and Yellowstone National Parks are waiving entrance fees tomorrow in recognition of National Public Lands Day. Grand Teton National Park Spokesperson Jackie Skaggs says National Public Lands Day is also a time for individuals across America to volunteer their time and energy through beneficial projects. Visitors to Grand Teton are being invited to join the Jackson Hole Wildlife Foundation, National Parks Conservation Association, and Grand Teton National Park for a project to modify an old fence on the Elk Ranch by replacing a lower strand of barbed wire with wildlife-friendly smooth wire. Volunteers will also install wooden top rails and “calf jumps” to help bison, elk, moose and deer as they migrate across park land. The project will run from 9:00 am to 3:00 pm. Meanwhile, Yellowstone National Park is looking for volunteers to participate in trail restoration work along the Purple Mountain Trail near Madison Junction. That work includes installing water bars and other trail structures that will greatly improve conditions of the trail. That project will run from 9:00 am until 4:00 pm.