3) Proprietary issues. We prohibit private sales of images of our exhibits and animals, especially as stock images. We state on the visitor maps that people are welcome to take photos for their private use, but any commercial photography must be licensed and falls under location fees. With the advancement of digital cameras and camcorders, we are finding more and more people selling images taken here – a private business that receives no public funds – without a license. We find these regularly and contact the sites to remove the images, and take further action if needed. We're a non-profit organization, and feel strongly that any sales of images should benefit our education and conservation research programs – whether they're taken by our photographers or outside photographers under contract."