The largest mammal on Earth is the blue whale.

Quick Scoop

  • The blue whale is not just the largest mammal, but the largest animal known to have ever lived.
  • It can reach about 33–34 meters (around 108–110 feet) in length.
  • The heaviest recorded individuals weigh around 190–199 tonnes (up to roughly 430,000 pounds).
  • Despite their enormous size, blue whales mainly eat tiny shrimp-like creatures called krill.
  • They live in oceans around the world and play an important role in marine ecosystems.

A fun way to picture it: a blue whale can be longer than a full-size basketball court and heavier than dozens of large elephants combined.

TL;DR: The answer to “what is the largest mammal on Earth” is the blue whale, reaching over 30 meters long and close to 200 tonnes in weight.

Information gathered from public forums or data available on the internet and portrayed here.