We have been on many adventures with David as a leader, both short domestic trips and long-term International ones. We have always learned a lot and had a great time. His knowledge of birding, especially by ear, is phenomenal. His enthusiasm to share his expertise in all areas of natural history is contagious.
— Lynne & Larry, Placerville

It is so impressive how David knows so much about about many aspects of Nature. I learned so much about birds and their environment. I would highly recommend David,
— Andrew, New Jersey

David Rocks
— Rachel, Portugal

David sure knows so much about everything! He makes me want to study more!
— Joan, San Francisco

David is not only knowledgeable but has a wonderful way of educating the young and old alike.
— Kelly, California