U.S. Department of Agriculture On Line Photography Center
This collection of photographs features images related to USDA activities including firefighting, agriculture, animals, conservation, aquaculture, forestry, and many more topics.

U.S. Department of Agriculture PLANTS Database Image Gallery
This image gallery features 40,000 + photos and line drawings of plants, primarily from the United States.

U.S. Environmental Protection Agency Photo Library
This photo library contains photographs of invertebrates, fish, birds, butterflies, streams/rivers, lakes, and water recreation related to biological indicators of watershed health.

U.S. Fish and Wildlife Service National Digital Library
The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video and that are in the public domain.

U.S. Forest Service "Find-a-photo"
Find-a-Photo provides access to thousands of wildlife, fish, wildflower and environmental education photographs provided by Forest Service employees, Forest Service partners, and volunteers.

U.S. Geological Survey Photo and Image Collections
This Web page features a comprehensive list of USGS photo and image collections including biology, ecosystems, water, national parks, and other topics.

National Biological Information Infrastructure Library of Images from the Environment  
The NBII-LIFE Web site features images of animals, fungi and lichens, plants, microorganisms, interactions among species, landscapes and weather, environmental topics, research, and management.

National Oceanic and Atmospheric Administration Photo Library
Includes many images of ocean exploration, coral reefs, marine organisms, fisheries, coastlines, estuaries, and historical images.

U.S. National Park Service Digital Image Archives
This site provides links to public domain digital images of many U.S. NPS sites including national parks, monuments, historic sites, and related areas.

CalPhotos
CalPhotos features over 150,000 digital images of organisms from categories such as plants, animals, fungi, landscapes, and more.

ForestryImages.org
ForestryImages.org is a source for images of forest pests, trees, plants and stand types, wildlife, and other forestry related images. It is a collaboration between the University of Georgia and the USDA Forest Service.

University of Tennessee Herbarium - TENN
This searchable herbarium includes descriptions and photos of bryophytes, fungi, and vascular plants.

Digimorph.org
The Digital Morphology library features high resolution X-ray computer tomography (CT) images of organisms including invertebrates, sharks and fish, amphibians, reptiles, mammals, birds, and dinosaurs.

Morphbank.net
Morphbank is a database of images used for research and education. Images are used for research in comparative anatomy, morphological and taxonomic studies, and for general knowledge.