The penny appearing on the artwork is only for scale.   Salt Seeker Tiger Swallowtail Butterfly Traditional Miniature Acrylic Image: 3 x 3“ Frame: 7 1/2 x 7 1/2” $1,450 USD Like all living things, pollinators need minerals. Sodium in particular is very important to butterflies, especially to females for egg laying. In order to collect this vital mineral, you may often see these fluttering beauties gathered at mud puddles, but these salt seekers might also chance upon an unusual source during dry spells, such as these freshly harvested saltwater clams.