Small but mighty : why Earth's tiny creatures matter

"Some of the smallest animals have the mightiest powers. Big, brawny creatures may seem like the stars of the animal kingdom, but Earth's smallest inhabitants have impressive powers too. Ofter overlooked, these tiny critters help ecosystems thrive in numerous ways: they spread seeds, pollinate plants, make nutrient-rich soil -- or even become an essential meal for a predator. Gulp! Full of fascinating facts and information, Small but Mighty intro...