From Site:
Water bears, similar to the one pictured here, were sent to low-Earth orbit in an ESA satellite
(Courtesy: Ralph Schill)
"They are the first animals known to be able to survive the harsh combination of low pressure and intense radiation found in space.
Water bears, also known as tardigrades, are known for their virtual indestructibility on Earth. The creatures can survive intense pressures, huge doses of radiation, and years of being dried out."
[via: http://space.newscientist.com]