Perucetus Colossus: Earth's Heaviest Giant Ever The blue whale, Earth's largest creature, can reach lengths of up to 100 feet and weigh as much as 200 tons. Despite their massive size, they primarily feed on tiny krill. Their hearts alone can weigh as much as an automobile, and their hauntingly deep songs can be heard for hundreds of miles underwater. #perucetuscollosus #heaviest #whale #whales #whalewatching #ocean #humpbackwhale #killerwhale #whalelove #whaleart #savethewhales #whalelove #whal