species of mammal
The sei whale (*Balaenoptera borealis*) is a large baleen whale found in oceans worldwide, making it one of the fastest whales in the sea. It matters because it was heavily hunted during the whaling era, and understanding its population and behavior today helps scientists monitor the recovery of whale species and ocean health.
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dike whale
SPECIES
Las ballenas nadan en grupos de 2-5, pero se pueden observar animales solitarios o grupos de hasta 12 ó 30 individuos. Esta especie es uno de los rorcuales más rápidos, alcanzando velocidades de hasta 20 nudos y cambia de dirección erráticamente, sin embargo durante la alimentación se mueven despacio, sacando parte de la cabeza y el dorso. Los individuos salen a respirar 2-3 veces entre buceos cortos de 5-6 minutos de duración, mientras que salen a respirar entre 5 y 6 veces entre buceos de 15-30 minutos de duración (Wynne y Schwartz, 1999). El soplo puede alcanzar entre 3 y 5m de altura y se puede escuchar, bajo ciertas circunstancias hasta casi 1 milla de distancia. Entre más tiempo pase el animal bajo el agua, mayor será el tamaño del soplo (Tomilin, 1957). Cuando realizan un buceo, generalmente arquean el cuerpo, sacando el pedúnculo y exhibiendo la aleta caudal.
via GBIF · IUCN
The sei whale (/seɪ/ SAY, Norwegian: [sæɪ]; Balaenoptera borealis) is a baleen whale. It is one of ten rorqual species, and the third-largest member after the blue and fin whales. It can grow to 19.5 m (64 ft) in length and weigh as much as 28 t (28 long tons; 31 short tons). Two subspecies are recognized: B. b. borealis and B. b. schlegelii. The whale's ventral surface has sporadic markings ranging from light grey to white, and its body is usually dark steel grey in colour. It is among the fastest of all cetaceans, and can reach speeds of up to 50–55 km/h (31–34 mph) over short distances.
It inhabits most oceans and adjoining seas, and prefers deep offshore waters. It avoids polar and tropical waters and semi-enclosed bodies of water. The sei whale migrates annually from cool, subpolar waters in summer to temperate, subtropical waters in winter with a lifespan of 70 years. It is a filter feeder, with its diet consisting primarily of copepods, krill, and other zooplankton. It is typically solitary or can be found in groups numbering half a dozen. During the breeding period, a mating pair will remain together. Sei whale vocalizations usually last approximately half a second, and occurs at 240–625 hertz.
via Wikidata · CC0
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