Saturday was a work day for us. Visitors were not numerous so we and another couple who are also volunteers spent the morning by clearing infringing brush from two short walking trails in visitor areas of Shark Valley tour road. One was a 1/4 mile loop and the other just a short out, & back trail near the observation tower. The couple who helped us work and live at the park's education center, a few miles from us. The education center is now closed for the Christmas break and so they had nothing to do. We were finished by noon so them Pam & I spent the afternoon in research and final preparations for the "table talks" that we will be giving for visitors, starting next week.