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Concept
Rorqual
Summary
Rorquals (ˈrɔrkwəlz) are the largest group of baleen whales, which comprise the family Balaenopteridae, containing ten extant species in three genera. They include the largest animal that has ever lived, the blue whale, which can reach , and the fin whale, which reaches ; even the smallest of the group, the northern minke whale, reaches .
Rorquals take their name from French rorqual, which derives from the Norwegian word : the first element røyr originated from the Old Norse name for this type of whale, reyðr, probably related to the Norse word for "red", and the second from the Norse word hvalr meaning "whale" in general. The family name Balaenopteridae is from the type genus, Balaenoptera.
All members of the family have a series of longitudinal folds of skin running from below the mouth back to the navel (except the sei whale and common minke whale, which have shorter grooves). These furrows allow the mouth to expand immensely when feeding. These "pleated throat grooves" distinguish balaenopterids from other whales.
Rorquals are slender and streamlined in shape, compared with their relatives the right whales, and most have narrow, elongated flippers. They have a dorsal fin, situated about two-thirds the way back. Most rorquals feed by gulping in water, and then pushing it out through the baleen plates with their tongue; the exception is the gray whale, which gulps in and filters large amounts of marine sediments from the seafloor. They feed on crustaceans, such as krill, but also on various fish, such as herrings and sardines.
Gestation in rorquals lasts 11–12 months, so that both mating and birthing occur at the same time of year. Cows give birth to a single calf, which is weaned after 6–12 months, depending on species. Of some species, adults live in small groups, or "pods" of two to five individuals. For example, humpback whales have a fluid social structure, often engaging behavioral practices in a pod, other times being solitary.
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