WATER BEARS ACTIVE & DORMANT WATER BEAR EGGS Water bears (or tardigrades) are tiny invertebrates that live in aquatic and semi-aquatic habitats such as lichen and damp moss. They require water to obtain oxygen by gas exchange. However, in dry conditions, they can enter a cryptobiotic state of dessication, known as a tun, to survive. In this state, water bears can survive for up to a decade.
Water bears are found throughout the world, including regions of extreme temperature, such as hot springs, and extreme pressure, such as deep underwater. They can also survive high levels of radiation and the vacuum of space.
 Water Bear welcomes you.
 Water bear tun (Milnesium alpigenum - formerly Milnesium tardigradum). Color enhanced scanning electron micrograph (SEM) of a water bear in its dormant state, known as a tun.
Milnesium alpigenum is a carnivore that feeds on nematodes, rotifers and protozoa. This specimen originated from moss samples in Tubingen, Germany.