Giant tortoises are some of the long-lived species on the planet. Here’s what biologists now understand about one of nature’s ...

San Diego Zoo mourns the loss of Gramma, a Galápagos tortoise estimated to be 141 years old. Born in the Galápagos Islands, she became a beloved "Queen of the Zoo" after arriving in the late 1920s.

Across nearly a century and a half, a single Galápagos tortoise watched the world change around her, outlasting wars, cultural revolutions, and more than twenty occupants of the White House. Now ...