A report on Pinniped and Fin

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Restoration of Puijila
Fins are used by aquatic animals, such as this orca, to generate thrust and control the subsequent motion
Fossil of Enaliarctos
Caudal fin of a great white shark
Fossil skull cast of Piscophoca sp. from Phocidae
Aquatic animals typically use fins for locomotion (1) pectoral fins (paired), (2) pelvic fins (paired), (3) dorsal fin, (4) adipose fin, (5) anal fin, (6) caudal (tail) fin
Reconstruction of Archaeodobenus akamatsui family Odobenidae
Comparison between A) the swimming fin of a lobe-finned fish and B) the walking leg of a tetrapod. Bones considered to correspond with each other have the same color.
Male and female South American sea lions, showing sexual dimorphism
In a parallel but independent evolution, the ancient reptile Ichthyosaurus communis developed fins (or flippers) very similar to fish (or dolphins)
Light reflection on an elephant seal eye
In the 1990s the CIA built a robotic catfish called Charlie to test the feasibility of unmanned underwater vehicles
Frontal view of brown fur seal head
Vibrissae of walrus
Weddell seal underwater
Northern elephant seal resting in water
Walrus on ice off Alaska. This species has a discontinuous distribution around the Arctic Circle.
Harbor seal hauled out on rock
Steller sea lion with white sturgeon
Leopard seal capturing emperor penguin
Orca hunting a Weddell seal
Walrus herd on ice floe
Northern fur seal breeding colony
Male northern elephant seals fighting for dominance and females
Harp seal mother nursing pup
Adult Antarctic fur seal with pups
Walrus males are known to use vocalizations to attract mates.
Sea lion balancing a ball
Inuit seal sculptures at the Linden Museum
Captive sea lion at Kobe Oji Zoo Kobe, Japan
Men killing northern fur seals on Saint Paul Island, Alaska, in the mid-1890s
Protests of Canada's seal hunts
Grey seal on beach occupied by humans near Niechorze, Poland. Pinnipeds and humans may compete for space and resources.

Pinnipeds (pronounced ), commonly known as seals, are a widely distributed and diverse clade of carnivorous, fin-footed, semiaquatic, mostly marine mammals in the clade Pinnipedia.

- Pinniped

These were the seals.

- Fin

1 related topic with Alpha

Overall

Cetacea

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Infraorder of aquatic mammals that includes whales, dolphins, and porpoises.

Infraorder of aquatic mammals that includes whales, dolphins, and porpoises.

Dolphin anatomy
Humpback whale fluke
Biosonar
Bubble net feeding
Killer whale porpoising
Two views of the skeletons of Dorudon atrox, extinct for 40 million years, and Maiacetus inuus, extinct for 47.5 million years, in the swimming position for comparison.
Cetaceans display convergent evolution with fish and aquatic reptiles
Fossil of a Maiacetus (red, beige skull) with fetus (blue, red teeth) shortly before the end of gestation
Whales caught 2010–2014, by country
Dominoes made of baleen
A whale as depicted by Conrad Gesner, 1587, in Historiae animalium
"Destruction of Leviathan" engraving by Gustave Doré, 1865
Silver coin with Tarus riding a dolphin
Constellation Cetus
Depiction of baleen whaling, 1840
Stranded sperm whale engraving, 1598
Sea World show featuring bottlenose dolphins and false killer whales
Ulises the orca, 2009
Dawn Brancheau doing a show four years before the incident
SeaWorld pilot whale with trainers

A few toothed whales, such as some orcas, feed on mammals, such as pinnipeds and other whales.

The fluke is set horizontally on the body, unlike fish, which have vertical tails.