That's about 4 tons of krill, which is a small crustacean that lives in the ocean. To put that into perspective, that's about the weight of a small car!
However, it's important to note that:
* They don't eat that much every day. This is the maximum amount they can eat when they're actively feeding.
* They eat in bursts. Blue whales will typically feed for a few hours a day, then rest for the rest of the time.
Despite their massive size, blue whales are actually quite efficient eaters. They have baleen plates in their mouths that act like giant filters, allowing them to strain krill from the water.