Have you seen a marine animal in the natural environment? Perhaps one with unique markings or exhibiting an interesting behavior? Maybe you've seen one that has been tagged by scientists.
The Marine Animal Identification Network (MAIN) provides information on tagged animals (primarily seals) and a database of sightings. The site is intended to make it easy for citizens to report their marine animal sightings, and in the process to learn more about their activities and to help develop a scientific database for further study.