 Being a slowly-maturing bird with no known natural predators in adulthood, an Andean condor is quite a long-lived bird. Longevity and mortality rates are not known to have been extensively studied in the wild. Some estimations of lifespans of wild birds has exceeded 50 years. In 1983, the Guinness Book of World Records considered the longest-lived bird of any species with a confirmed lifespan was an Andean condor that died after surviving 72 years in captivity, having been captured from the wild as a juvenile of undetermined age. Several species of parrot have been reported to live for perhaps over 100 years, but these (at least in 1983) were not considered authenticated. Another early captive-held specimen of condor reportedly lived for 71 years. However, these lifespans have been exceeded by a male, nicknamed "Thaao", that was kept at Beardsley Zoo in Connecticut. Thaao was born in captivity in 1930 and died on January 26, 2010, making him 79 years of age. This would be the greatest verified age ever known for a bird.
