The most common seal is ringed seal, followed by hooded seal and harp seal. It has been found in the hooded seal ("Cystophora cristata"). The hooded seal can live to about age 30 to 35. The Hooded Seal is protected under the Marine Mammal Protection Act of 1972. The species were the hooded seal ("Cystophora cristata") and harp seal ("Phagophilus groenlandicus").