The following list includes several specialized databases that provide broad coverage of endangered and threatened species. There are also some research databases of a more general nature included here that would be helpful for researching this topic as they cover a variety of aspects of animals, science, conservation and law.
Note also that there are variations in how subjects are categorized in each database. However, the list included in this guide of subjects and keywords may be helpful when searching many online databases.
The subscription resources marked with a padlock are available to researchers on-site at the Library of Congress. If you are unable to visit the Library, you may be able to access these resources through your local public or academic library.