They are the third largest whales after
Blue Whales and fin whales. They all
to one species
- Balaenoptera borealis.
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other two, they
belong to the group of baleen
whales and rorquals.
They can be up to
20 meters long and weigh up to 45 tonnes. They are filter feeders and
they eat almost 1 tonne food
every day. They are also some of the fastest swimmers and can swim as
fast as 50km/h. They prefer to live in deep ocean waters but they don't
dive very deep. They are found in almost all oceans except tropical and
polar waters. Like other large whales, they migrate between feeding and
breeding grounds and they make loud low frequent noises.
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often swim alone but
sometimes in small groups. Feeding groups can be large.
whaling days, they were less profitable than Blue, Humpback and Fin
But once those three started to diminish, Seis were taken
and their populations ended up decreasing by 80%. There are now about
55,000 of them left.