Speed the Galápagos tortoise dies at San Diego zoo at more than 150 years old

The alpha male arrived in 1933 as part of an effort to help preserve the giant tortoises that live on Cerro Azul Volcano on Isabela Island

At more than 150 years old, San Diego's oldest resident - a Galipagos tortoise called Speed - passed away on Friday, according to the San Diego Zoo.

Speed arrived at the San Diego Zoo in 1933 as part of an effort to help preserve the giant tortoises that live on Cerro Azul Volcano on Isabela Island. Recently, the zoo has struggled to keep Speed alive through hydrotherapy, acupuncture, medication and even physical therapy.