Titanoboa was 13m (42ft) long - about the length of a bus - and lived in the rainforest of north-east Colombia 58-60 million years ago.
The snake was so wide it would have reached up to a person's hips, say researchers, who have estimated that it weighed more than a tonne.
Green anacondas - the world's heaviest snakes - reach a mere 250kg (550lbs).
Reticulated pythons - the world's longest snakes - can reach up to 10m (32ft).
The snake was so wide it would have reached up to a person's hips, say researchers, who have estimated that it weighed more than a tonne.
Green anacondas - the world's heaviest snakes - reach a mere 250kg (550lbs).
Reticulated pythons - the world's longest snakes - can reach up to 10m (32ft).
