SAN DIEGO'S SEAWORLD Here you will find educational displays and aquariums housing a variety of fish, invertebrates, and marine mammals, Orcas, or killer whales star as the main attraction. Displays of California sea otters and Antarctic penguins are also featured at the park. SeaWorld opened in 1964. Its aquariums hold more than 15,000 specimens of fish, including one of the world's largest collections of sharks. The San Diego park also houses 1,400 birds. © Janet Aguila Krause