Biologically inspired design perhaps is one of the most important movements in engineering design. The paradigm espouses use of analogies to biology in generating conceptual designs for new technologies. In this paper, we briefly summarize some empirical findings about biologically inspired design, and then develop an information-processing theory of creative analogies in biologically inspired design. We also compare our theory with similar theories. In addition, we examine how biologically inspired design is fundamentally different from other design paradigms.