On May 23rd, 2018, I decided to make all my photos available under the Creative Commons Attribution-NonCommercial-ShareAlike license (CC BY-NC-SA). Click here for license details (external link).
This means that you can use my shots for personal use without contacting me. This license does not permit commercial use. However, if you do wish to use one or more of my photos for commercial purposes, please email me and we'll come to an agreement. There is a very limited market for bird photos like mine, so I generally charge very reasonable rates. If it is a small project, I may charge nothing at all and/or only ask for a "comped" copy of whatever you are producing. The only exception to this is the following: I do not grant permission for my photos to be used by tour companies, tour operators, or any other entity to advertise or promote any tour, unless the tour is being operated by Tropical Birding Tours, as this would be a conflict of interest and would cause problems with my partners.
Photo credit: At a minimum, the credit should be "Nick Athanas". If possible, I also appreciate having a link to my website or Flickr site, e.g. "Nick Athanas - " or "Nick Athanas - "
I am no longer watermarking photos, though some older shots may still have one. You may crop out the watermarks present on older photos as long as you properly credit the photo in some other manner.
I can be reached by email at email@example.com. Occasionally I am out of contact and may not be able to respond immediately.