These unique 16.9-ounce ceramic mugs are a wonderful way to track your travel and bird-watching milestones! Our beautiful Birder's Mug features a map with fifty-five birds for you to check off as you spot them. There's a guide to help you identify the birds, too! Our magnificent National Parks Mug lists sixty-three US national parks, also indicated on a pretty map. Both mugs come with a green ceramic pen that you can use to check off the lists as you go—just bake it at 320?F for twenty-five minutes to set the ink. Mugs are microwave and dishwasher safe, sustainably made in Europe (with plastic-free packaging), and a portion of the profits are donated to UK environmental charities. Please specify design.