I received them well! I was already looking for photos of specimens for these species. Here in the Netherlands it is not allowed to photograph these extinct animals in the Leiden Museum, and they are behind glass in a quite dark room, that light only one wall at the time. So thanks again.
The Public Domain, Copyright free images can be used without problems. Images that are licensed with Creative Commons, Free Art License, GNU Free Documentation License, etc. can also be used but there are restrictions or things you need to do. You can read about them on wikipedia.
When you click on a image you can see how the image is licensed, and how you can use it!
This mean the images of this page are also free for commercial publication (Of couse the ''public domain'' declared ones)? The page: images.fws.gov/ Here the faq (I´m having some difficult to understand it because my English is very bad): faq.fws.gov/imagefaq.html
Yes! The vast majority of images on US government sites are in the public domain! And can freely be used. But they ask to credit the creator.
Most of the images on our Web pages are in the "public domain," which means they have no copyright restrictions. If an image on one of our sites is not restricted and does not say it is copyrighted, then you can assume it is in the public domain. You may download and use these copyright-free images in your print and electronic publications. There is no fee and no need to get permission from the Service for using them. Images in the public domain may credit the artist or photographer, or identify the source (example: Credit: U.S. Fish and Wildlife Service, Robert Wilson). This does not mean the image is copyrighted. But please credit the artist or photographer and the U.S. Fish and Wildlife Service if at all possible.