The huge whales can eat up to four tonnes of krill every day. Blue whales lunge through large swarms of krill with their mouths open, taking in more food in one mouthful than any other animal on Earth ...

To sustain their huge bodies, blue whales ... form the starting point of the food web. A team at the University of Washington examined five samples of whale feces—two samples collected from ...

Blue whales are the largest animals ever to have lived ... Killer whales are apex predators, meaning they are at the top of their food chain. They feed on fish and squid like other toothed whale ...

They stimulate production of microscopic marine algae, or phytoplankton, which form the base of many marine food chains. Phytoplankton ... and even marine mammals, including whales. In a study of blue ...