Lonesome George, the last known individual of the Pinta Island...

Lonesome George, the last known individual of the Pinta Island Tortoise, subspecies Geochelone nigra abingdoni, walks around Galapagos National Park's breeding center. (April 19, 2012) Credit: AFP/Getty Images

Giant tortoise experts from near and far have begun an autopsy of Lonesome George, whose failed efforts to reproduce made him a symbol of disappearing species.

The Galapagos Island reptile was the last of the Pinta island giant tortoise subspecies and he was found dead in his pen on Sunday.

He had become an ambassador of sorts for the archipelago off Ecuador's coast whose unique flora and fauna helped inspire Charles Darwin's ideas on evolution.

Galapagos conservation official Washington Llerena says scientists suspect Lonesome George died of a heart attack. His was believed to be about 100 years old, not especially old for a giant tortoise.

Scientists from the U.S. were aiding in the autopsy by videoconference.

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