The US Fish and Wildlife Service Digital Library is a fascinating site that features resources on a wide range of topics. You’ll find sections on habitats and landscapes, wildlife refuges and plants to name a few. The site is easy to navigate with search and browse options.
The strongest feature of this digital library is the amazing photographs of nature that are found throughout. As well as images there are also audio and video files and publications put out by the agency. Have a browse and get in touch with nature.