A group comprised of several species of aquatic carnivores in different genera, in the family Otariidae. In comparison to FUR SEALS, they have shorter, less dense hair.

Large, chiefly nocturnal mammals of the cat family FELIDAE, species Panthera leo. They are found in Africa and southern Asia.

The suborder of aquatic CARNIVORA comprising the WALRUSES; FUR SEALS; SEA LIONS; and EARLESS SEALS. They have fusiform bodies with very short tails and are found on all sea coasts. The offspring are born on land.

Somewhat flattened, globular echinoderms, having thin, brittle shells of calcareous plates. They are useful models for studying FERTILIZATION and EMBRYO DEVELOPMENT.

A calicivirus infection of swine characterized by hydropic degeneration of the oral and cutaneous epithelia.

A free-floating DNA virus genus, unattached to any family, comprising several species of hepatitis-related viruses.

A genus of the family POXVIRIDAE, subfamily CHORDOPOXVIRINAE, which infect ungulates and may infect humans. ORF VIRUS is the type species.

The family Phocidae, suborder PINNIPEDIA, order CARNIVORA, comprising the true seals. They lack external ears and are unable to use their hind flippers to walk. It includes over 18 species including the harp seal, probably the best known seal species in the world.

An activity in which the organism plunges into water. It includes scuba and bell diving. Diving as natural behavior of animals goes here, as well as diving in decompression experiments with humans or animals.

A great expanse of continuous bodies of salt water which together cover more than 70 percent of the earth's surface. Seas may be partially or entirely enclosed by land, and are smaller than the five oceans (Atlantic, Pacific, Indian, Arctic, and Antarctic).

Toxic or poisonous substances elaborated by marine flora or fauna. They include also specific, characterized poisons or toxins for which there is no more specific heading, like those from poisonous FISHES.

The type species of the genus VESIVIRUS infecting pigs. The resulting infection is an acute febrile disease which is clinically indistinguishable from FOOT AND MOUTH DISEASE. Transmission is by contaminated food.

Species of ENTEROVIRUS causing mild to severe neurological diseases among pigs especially in Eastern Europe. Mild strains are also present in Canada, U.S., and Australia. Specific species include Porcine enterovirus A and Porcine enterovirus B.

A genus of the family CALICIVIRIDAE comprised of species infecting a wide range of organisms. Most members of this genus can be readily propagated in cell culture (as opposed to other genera of Caliciviridae). The type species is VESICULAR EXANTHEMA OF SWINE VIRUS.

Clinical manifestation of excessive LEANNESS usually caused by disease or a lack of nutrition (MALNUTRITION).