Quick Read
A blue whale is an enormous marine mammal that breathes air with lungs.
Learn More
Twenty-five metres is a representative adult length. Actual size varies by sex, age, and population.
In Depth
Regional populations differ in average length. This comparison uses body length and excludes pose or motion.
Scale measurement
25 m · length
Quick facts
- It is a mammal.
- It breathes with lungs.
- Krill are its principal food.