they are known to be species of mammals to have lived on Earth. they are found in all the oceans of the world. a mature fish may 27 and 30 metres in length, weighing about 150 to 180 tons. blue whale species is omnivores and prefer to feed in the cold waters. to the reproductive period, they migrated to the region of warm water. a blue whale that just born 1 child within 2 to 3 years, pregnancy period lasted almost a year. they can live up to 40 years. Currently, they are the animals in danger of extinction due to hunting and already has been put on the "red list" of the world
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