In 2001 the USPS issued this se-tenant of 34 cent stamps of carnivorous plants. Growing mainly in nitrogen-poor bogs, carnivorous plants catch and digest insects in order to obtain the nitrogen they need. The plants attract insects just as ordinary plants do, but when an insect lands, a well-designed trap goes into action. This stamp se-tenant shows a Venus flytrap, a yellow trumpet, a cobra lily, and an English sundew as illustrated by artist Steve Buchanan.