In 2002 I began a long running series of works involving bird images and using asphalt on cement panels. This series focuses on bird species in North America whose populations are in decline. The primary reason for their decline is loss of habitat which lead me to use the construction materals asphalt and cement. These materials represent the man made environment that is replacing the birds' natural habitats of forests, wetlands, etc. Most of the work in this series uses images based on Audubon's "Birds of North America" as a reference to another time when the birds were much more plentiful. I use silhouettes to imply that the birds are disappearing, leaving only the shadows of their presence behind. From 2003 until recently I have expanded the silhouette series into many different combinations of bird images, the ones shown here are but a few examples.