Temporal range: Palaeocene
Titanoboa was the largest known snake. Now extinct, the snake was a relative of the Anaconda and the Boa constrictor. It was about 40 to 50 feet long (12–15 m), and weighed over a ton. The snake lived in the Palaeocene epoch, about 58 million years ago. It was about three feet (1m) in diameter at the thickest part of its body.
The fossil was found in an open-cast coal mine in Colombia, in 2009. Plant fossils at the site proved the climate at the time was a tropical rainforest. The site was in the Cerrejón Formation in La Guajira, Colombia. Other large reptile fossils have been found at this site.
- Kwok, Roberta (2009). "Scientists find world's biggest snake". Nature. http://www.nature.com/news/2009/090204/full/news.2009.80.html. Retrieved 2009-02-04.
- Previous record-holder was Gigantophis.
- O'Brien, Jane 2012. The giant snake that stalked the world. BBC News Magazine. 
- Head, Jason J. et al. 2009. Giant boid snake from the Paleocene neotropics reveals hotter past equatorial temperatures. Nature 457, 715–718.
- "Science Daily: At 2,500 pounds and 43 feet, prehistoric snake is largest on record.". ScienceDaily. 2009-02-04. http://www.sciencedaily.com/releases/2009/02/090204112217.htm. Retrieved 2009-02-06.