Micro-animals are animals so small that they can be visually observed only under a microscope.Microscopic arthropods, including dust mites, spider mites, and some crustaceans such as copepods and certain cladocera.
Tardigrades are one of nature's smallest animals. They are never more than 1.5 mm long, and can only be seen with a microscope. They are commonly known as "water bears".
