The blue whale is a cetacean from the Balaenopteridae family. It is the biggest animal that have ever existed in the sea and the earth. It's body length vary from 24 to 27 meters and it weight can be between 100 and 120 tons. It has a beauty blue skin that is brigther in his belly. Like other whales, it's diet consist in krill. This animal can be find in every world's ocean but actually, it's population decrease because of the indiscriminate human hunt and contamination.