The extinct giant snake (shown in an artist s reconstruction) would have sent even Hollywood s anacondas slithering away. Researchers conservatively estimate the snake weighed about 2,500 pounds (1,140 kg) and measured nearly 43 feet (13 meters) from nose to tail tip. It was a type of non-venomous constrictor like anacondas and boas and lived in South America s rainforests some 60 million years ago.