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They have callosities, unlike other whales, with the exception of the bowhead whale.

Mothers fast for a relatively long period of time over the period of migration, which varies between species.

Baleen whales produce a number of vocalizations, notably the songs of the humpback whale.

Baleen whales range in size from the 20 ft (6 m) and 6,600 lb (3,000 kg) pygmy right whale to the 112 ft (34 m) and 190 t (210 short tons) blue whale, which is also the largest creature on earth. Baleen whales can have streamlined or large bodies, depending on the feeding behavior, and two limbs that are modified into flippers.

Though not as flexible and agile as seals, baleen whales can swim very fast, with the fastest able to travel at 23 miles per hour (37 km/h).

Baleen whales (systematic name Mysticeti), known earlier as whalebone whales, form a parvorder of the infraorder Cetacea (whales, dolphins and porpoises).

They are a widely distributed and diverse parvorder of carnivorous marine mammals.However, the North Atlantic right whale is ranked critically endangered by the International Union for Conservation of Nature. Cetotheriidae consists of only one living member: the pygmy right whale (Caperea marginata).Besides hunting, baleen whales also face threats from marine pollution and ocean acidification. The first descriptions date back to the 1840s of bones and baleen plates resembling a smaller version of the right whale, and was named Balaena marginata.Rorquals use throat pleats to expand their mouths, which allow them to feed more effectively.However, rorquals need to build up water pressure in order to expand their mouths, leading to a lunge-feeding behavior.The meat, blubber, baleen, and oil of baleen whales have traditionally been used by the indigenous peoples of the Arctic. In a 2012 review of cetacean taxonomy, Alexandre Hassanin (of the Muséum National d'Histoire Naturelle) and colleagues suggested that, based on phylogenic criteria, there are four extant genera of rorquals.

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