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en.wikipedia.org/wiki/Pectoral_fin

Pectoral fins The paired pectoral fins are located on each side, usually just behind the operculum, and are homologous to the forelimbs of tetrapods.. A peculiar function of pectoral fins, highly developed in some fish, is the creation of the dynamic lifting force that assists some fish, such as sharks, in maintaining depth and also enables the "flight" for flying fish.

consciousbreathadventures.com/pectoral-fin-slapping

Pectoral Fin Slapping Pectoral fin slapping, commonly referred to as “pec slapping,” is when a humpback whale that is swimming on its side or back repeatedly raises its pectoral fin into the air and drops or swings it back to the surface to produce a large splash and loud report. Along with breaching and lobtailing, pec slapping

baleinesendirect.org/en/what-purpose-do-fins-serve-in-whales

Whales generally have four fins: two pectoral fins (instead of arms), a caudal fin (also called the tail) and a dorsal fin. The caudal fin is used for propulsion of the animal, with up-and-down movements created by powerful muscles along the peduncle. The two pectoral fins serve as the whales' rudders and stabilizers.

www.aquaticadventures.com/the-humpback-whale

Pectoral Fin . Humpback whales have extraordinarily long pectoral fins, nearly one third the length of the whale. The length and shape of the pectoral fins facilitate the graceful movement humpbacks are known for, even allowing the whale to swim backwards and turn on a dime.

seaworld.org/animals/all-about/killer-whale/characteristics

The pectoral flippers of male killer whales are proportionately larger than those of females. A large male killer whale may have pectoral flippers as large as 2 m (6.5 ft.) long and 1.2 m (4 ft.) wide. A female's pectoral flippers are significantly smaller. A killer whale's pectoral flipper contains 5 digits much like the fingers on a human hand.

www.whales.net/whales

Humpback whales are mid-sized baleen whales that frequent our area in the summer months. They get their name “Humpback” from a small hump on their back located just in front of their small dorsal fin. These whales have a black body with white flippers (pectoral fins). These flippers are the longest of any whale, reaching up to 15 feet.

en.wikipedia.org/wiki/Humpback_whale

The humpback whale (Megaptera novaeangliae) is a species of baleen whale. One of the larger rorqual species, adults range in length from 12–16 m (39–52 ft) and weigh around 25–30 metric tons (28–33 short tons). The humpback has a distinctive body shape, with long pectoral fins and a knobbly head.

www.ftexploring.com/askdrg/askdrgalapagos3.html

Inside every whale flipper (or pectoral fin, as the experts like to call it) is a cute collection of bones that look suspiciously like a human hand - complete even with thumb bones. Flukes up, ready for a powerful downward thrust. The tail-flukes of the sperm whale are more flexible than most whale flukes.

oceantoday.noaa.gov/killerwhaleanatomy

Other animals may not recognize a Killer whale until it’s too late. Male Orcas have the largest dorsal fin of any marine mammal. It can get up to 6 feet tall. On females it’s a bit shorter and more curved. The dorsal fin acts like a keel, and each dorsal fin is unique for each Orca.

coast.noaa.gov/data/SEAMedia/Lessons/G3U5L1 Anatomy of a...

dorsal fin: the small fin on the back of the whale used for balance in the water. flukes: the two lobes of a whale’s tail. marine mammal: mammals that live in the ocean. pectoral fins: the two paddle-shaped front limbs of whales, used for steering and stopping. ... LeSSON 1 Anatomy of a Humpback Whale 1. 5. 1.