Birdwatching design. Redwing Blackbirds love to perch on cattails and wild grasses in wetland areas. For bird enthusiasts and nature lovers, this birdwatching design showcases the beauty and wonder of avian wildlife. For birding expeditions or everyday use by ornithology fans who spot avian friends in their natural habitat. Dual wall insulated: keeps beverages hot or cold Stainless Steel, BPA Free Leak proof lid with clear slider