But examine that water under a microscope and you will see your bucket contains a universe of microscopic life, in the form of beautiful and fascinating plankton. Plankton are mostly microscopic ...

Image caption, This is one type of plankton viewed through a microscope. In fact, many scientists believe that these tiny plants and animals are amongst the most important in our seas. They may ...

If you examine a sample of seawater under a microscope in spring, you will see tiny crustaceans known as copepods which spend their whole lives as plankton and are a key source of food for fish.