Strategies for Aging Vary Widely across 46 Species, with Some Scarcely Deteriorating

Description

Guppies and water fleas live only days or weeks, but their mortality increases sharply with age, as is the case in longer-lived animals such as humans. But other animals—such as the hermit crab, the red abalone and the hydra, a microscopic freshwater animal that can live centuries—buck that trend, enjoying near constant levels of fertility and mortality.