Why do blue whales eat krill?

The answer to this question is actually quite simple. Despite being the largest living mammal in the world the blue whales primary diet consists almost exclusively of krill, a small oceanic creature that generally measure in at a measly 1-2 centimeters; although a few species of krill can grow close to 6 inches in size. read more

They satisfy their hunger by eating lots of krill. :) More usefully, blue whales are filter feeders: they obtain food by sucking in seawater and straining out anything floating in it. read more

While consuming krill the blue whale may coincidentally swallow fish, crustaceans and squid that happen to be swimming in or near the school of krill it is hunting. In regards to diving for food the amount of time a blue whale dives for generally last around 10 minutes, although these whales have been recorded staying submerged for up to half an hour. read more

The largest mammal on Earth, the blue whale, is probably the most famous baleen whale. The humpback whale is another well-known example. The various types of right whales, including Northern, Southern and pygmy, also eat krill as a dietary staple. read more