US Fish and Wildlife
- Agency dealing with threatened flora and fauna, and the determination of endangered status.
- http://ecos.fws.gov/tess_public/TESSWebpageUsaLists?state=PR

Southeast Region | Puerto Rican Parrot
- Press releases with the most recent information.
- http://southeast.fws.gov/prparrot/

UN System-Wide Earthwatch
- Informational document about the species of the different islands of Puerto Rico, threats to their ecosystems, and species of conservation interest.
- http://islands.unep.ch/

Manatee Statistics
- Mortality Statistics and the total number of U.S. verified deaths,including Puerto Rico, from 1979 to 1996. Links to other interesting endangered species data.
- http://whale.wheelock.edu/archives/info97/0254.html