The Marine Mammal Center (TMMC) is a private, nonprofit U.S. organization that was established in 1975 for the purpose of rescuing, rehabilitating and releasing marine mammals who are injured, sick or abandoned. It was founded in Sausalito, California, by Lloyd Smalley, Pat Arrigoni, and Paul Maxwell.

Since 1975, TMMC has rescued over 28,000 marine mammals. It also serves as a center for environmental research and education regarding marine mammals, namely cetaceans (whales, dolphins and porpoises), pinnipeds (seals, fur seals, walruses and sea lions), otters and sirenians (manatees and dugongs). Marine mammal abandonment” refers to maternal separation; pups that have been separated from their mother before weaning.

At the center, they receive specialized veterinary care: they are diagnosed, treated, rehabilitated, and ideally released back into the wild. Animals in need of assistance are usually identified by a member of the public who has contacted the center.

These animals represent the following major species: California sea lions, northern elephant seals, Pacific harbor seals, northern fur seals, Guadalupe fur seals, Hawaiian monk seals, and southern sea otters.

On a few occasions, TMMC has taken in Steller sea lions and bottlenose/Pacific white-sided dolphins. The only non-mammals that TMMC takes in are sea turtles.

According to en.wikipedia.org