The microscopic world that feeds the whales
Blue whales feed on very small animals called krill, using their huge sieve-like mouth to catch thousands at a time. The krill feed on microscopic animals and plants called plankton that float in the upper layers of the ocean. So blue whales, which are the largest living creatures in the world, are directly dependent on some of the smallest creatures for their food.
After this, find out about kinds of microscopic