Sei whales are the third biggest whales the fin whales and the blue whales are the only bigger whales . The sea whales can get 19 m long and weigh 28 tones .
Sei whales are the fastest whales. They can go 38 kph but the sail fish can still go faster.
We got this picture from marinebio.org
Sei whales are baleen whales so they eat krill and zooplankton but they must eat 900 kg of plankton every day. That's a lot of food!
Sei whales live in deep waters of subpolar and subtropical oceans and are rarely found in tropical waters .
Mating happens in subtropical waters. The sei whale's gestation takes 11-12 months. They stop drinking milk and start eating plankton as they grow up. Females give birth every 2-3 years and start becoming mothers at 8-10 years old .
When a sailor caught a Sei whale he described the noise it made as a crying noise .
I got information from Wikipedia and the book "Whales Dolphins and Porpoises" by Harrison and Bryden.