1. The Blue Whale
A marine mammal belonging to the Baleen whale suborder, Blue Whales are the largest animals in existence today with these animals having the capability of reaching dimensions of upto 30 feet lengthwise alongside weighing upto 180 metric tonnes. The tongue of this massive sea animal alone weighs around 2.7 metric tonnes and its heart is the size of a small car. These whales feed exclusively on small fish like creatures called Krill with it feeding upto 40 million of them per day.