The extinct elephant bird could grow to over ten feet tall and weigh in at around half a ton, with its eggs about 180 times the size of a chicken egg. They lived well in Madagascar until about 2,000 years ago, when humans first settled the island; then, about 1,000 years later, they were extinct. In an upcoming documentary, Sir David Attenborough says it wasn't the skill of human hunters that caused the big bird's demise:
"I doubt it was hunted to extinction – anyone who has seen an ostrich in a zoo knows that it has a kick which can open a man's stomach and an enraged elephant bird, many times the size of an ostrich, must have been a truly formidable opponent."
Instead, he says, humans probably killed off the elephant bird by eating all their eggs---someone stumbling on a nest and stealing one of it's calorie-rich eggs ...