The red sea urchin found in the shallow waters of the Pacific Ocean is one of the Earth's longest-living animals. The small, spiny creature can last for more than 200 years with few signs of age-related disease, a US research team from Oregon and California has found. The animal, which grows to more than 15 cm across, grazes on marine plants and uses its spines to deter predators. "No animal lives forever, but these red sea urchins appear to be practically immortal," said Dr Thomas Ebert. The urchins (Strongylocentrotus franciscanus) were once considered the scourge of the sea. They ate...