Colored scanning electron micrograph (SEM) of a water bear(Paramacrobiotus craterlaki) in moss. Water bears (or tardigrades) are tiny invertebrates that live in aquatic and semi-aquatic habitats such as lichen and damp moss. P. craterlaki is a carnivorous species that feeds on nematodes and rotifers. 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. This specimen originated from moss samples in Crater Lake, Kenya. Magnification: x640 when printed at 10 centimetres wide.