No image in our database is in the public domain. Thus, we hold the copyright for all images of crania and all photographs of living mammals except for those provided by outside contributors. For noncommercial (academic or hobby) purposes, however, no restriction is imposed on the use of these skeletal images as well as our photographs. From those users in academic research or education, we would like to receive reprinted articles including our image data. However, this is not a requirement. If the materials in your research should consist exclusively of our images, your proposal for collaborative work would be welcome; nevertheless, this is not a prerequisite either. To add a reference link to our website is also free but inform us as soon as you have done so. For commercial use, please contact us for information, as there are conditions and restrictions.