"AviSys is the best birding software I have ever used. Thanks to AviSys, I can finally (and easily) keep track of exactly where and when I have seen each of my 3444 species. Thanks to its sophisticated features, I also can use AviSys for various research projects.

Despite its extensive capabilities, AviSys is easy to learn, and the excellent user's manual and support by the programmer himself are unequaled for leading one through its more advanced features. Being able to keep track of all the subspecies is also very useful, and makes dealing with the inevitable future splits relatively painless.

Regular updates, freely available online, make it possible to keep the taxonomy up-to-date with little effort and the increasing availability of bird, butterfly, and dragonfly checklists from various parts of the world is an important bonus. I recently started to make use of the Palm support and being able to record species in the field and then enter my data at home with the touch of a button is a great timesaver.

All in all, AviSys is a phenomenal program which does everything birdwatching software should do (and more) effectively and efficiently. I really cannot see how one can improve on this gem, but I am sure Jerry Blinn will surprise me by doing so for years to come."

Paul R. Ehrlich
Bing Professor of Population Studies
President, Center for Conservation Biology
Department of Biological Sciences
Stanford University, Stanford, CA 94305-5020