Blue whales are the largest creatures found on earth: they can reach a length of about 100 feet and weigh up to 120 tons. A blue whale heart is the size of a VW Beetle; its aorta (the main blood vessel) alone is large enough for a human to crawl through! Although blue whales are found worldwide throughout the ocean, these enormous creatures are also quite endangered. These two were spotted in Channel Islands National Marine Sanctuary, one place the whales are known to come to feed on krill during the spring and summer months.