Martin Mach says in his article "How is it possible that an animal can be found almost everywhere and at the same time is unknown to almost everybody?" His article provides a summary of the history, location, and awesomeness of the tardigrade. He includes pictures and a short video to help understand how they live and move.
Martin Mach's website is devoted to the tardigrade with over 150 "newsletters." He discusses the anatomy of the animal, the types of mosses they prefer, and so much more! This resource is the in depth detailed resource with lots of images as well.
In this resource, you have the hub of all things tardigrade in the United States. Links to books and websites by the leading researchers in this area are included. Teacher resources and how to find tardigrades guides are included. This website features an 8 minute video illustrating the longevity of tardigrades with their survival in space.