View full lesson: http://ed.ted.com/lessons/whyareblu...

Blue whales are the largest animals on the planet, but what helps them grow to the length of a basketball court? Asha de Vos explains why the size of krill make them the ideal food for the blue whale it's as if the blue whale was made to eat krill (and krill was made to be eaten by the blue whale).

Lesson by Asha De Vos, animation by Cognitive Media.