15 Fastest Growing Organisms in the World

9. The Blue Whale

Kingdom: Animalia

Scientific Name: Balaenoptera musculus

Growth Rate: 90 kg (200 pounds) per day

This marine mammal is recorded as the largest animal to have ever existed. The maximum length of the blue whale is 29.9 meters and maximum weight is 173 tonnes. Despite being huge in size, the giant creature is not a predator, maintaining a diet largely consisting of tiny plants known as krill. They are also, for the most part, entirely harmless to humans, allowing many divers and researchers to come extremely close to them in the water.