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Description
First non-Mesozoic animal. Closely related to living boas and anacondas within subfamily Boinae, Titanoboa is not only the largest snake ever discovered, but in its time, was also the largest continental vertebrate the planet had seen since the end of the Cretaceous. Although its size understandably led to the belief that it would've fed by constriction on enormous contemporary turtles and dyrosaur crocodyliforms, the reduced articulation between skull bones and numerous weakly-connected teeth suggests its main diet would have been fish and other relatively small aquatic animals, and the tendency for larger species of boid to have semiaquatic lifestyles suggests that Titanoboa rarely left the water, much like a certain dinosaurian superstar. Still, with a skull 40 cm (1 ft 4 in) in length, I wouldn't doubt its ability to swallow a person if they ever were to meet.

Interesting trivia: the snakes in Anaconda (1997) had animatronics 12.2 m in length, making them at least 60 cm shorter than adult Titanoboa; they're also substantially more gracile.

References:
-Head, J.J.; J.I. Bloch; A.K. Hastings; J.R. Bourque; E.A. Cadena ; F.A. Herrera; P.D. Polly, and C.A. Jaramillo . 2009. Giant boid snake from the paleocene neotropics reveals hotter past equatorial temperatures . Nature 457. 715–718.
-Head, Jason; Jonathan Bloch; Jorge Moreno Bernal; Aldo Fernando Rincón Burbano, and Jason Bourque. 2013. Cranial osteology, body size, systematics, and ecology of the giant Paleocene snake Titanoboa cerrejonensis ,Society of Vertebrate Paleontology , p. 140–141.
-Head, Jason; Jonathan Bloch; Jorge Moreno Bernal; Aldo Fernando Rincón Burbano, Jason Bourque, and Carlos Jaramillo. 2018. Postcranial anatomy of the giant snake Titanoboa cerrejonensis: implications for estimating ecology and body size. Society of Vertebrate Paleontology , p. 144.
-sketchfab.com/3d-models/verteb…

Description
First non-Mesozoic animal. Closely related to living boas and anacondas within subfamily Boinae, Titanoboa is not only the largest snake ever discovered, but in its time, was also the largest continental vertebrate the planet had seen since the end of the Cretaceous. Although its size understandably led to the belief that it would've fed by constriction on enormous contemporary turtles and dyrosaur crocodyliforms, the reduced articulation between skull bones and numerous weakly-connected teeth suggests its main diet would have been fish and other relatively small aquatic animals, and the tendency for larger species of boid to have semiaquatic lifestyles suggests that Titanoboa rarely left the water, much like a certain dinosaurian superstar. Still, with a skull 40 cm (1 ft 4 in) in length, I wouldn't doubt its ability to swallow a person if they ever were to meet.

Interesting trivia: the snakes in Anaconda (1997) had animatronics 12.2 m in length, making them at least 60 cm shorter than adult Titanoboa; they're also substantially more gracile.

References:
-Head, J.J.; J.I. Bloch; A.K. Hastings; J.R. Bourque; E.A. Cadena ; F.A. Herrera; P.D. Polly, and C.A. Jaramillo . 2009. Giant boid snake from the paleocene neotropics reveals hotter past equatorial temperatures . Nature 457. 715–718.
-Head, Jason; Jonathan Bloch; Jorge Moreno Bernal; Aldo Fernando Rincón Burbano, and Jason Bourque. 2013. Cranial osteology, body size, systematics, and ecology of the giant Paleocene snake Titanoboa cerrejonensis ,Society of Vertebrate Paleontology , p. 140–141.
-Head, Jason; Jonathan Bloch; Jorge Moreno Bernal; Aldo Fernando Rincón Burbano, Jason Bourque, and Carlos Jaramillo. 2018. Postcranial anatomy of the giant snake Titanoboa cerrejonensis: implications for estimating ecology and body size. Society of Vertebrate Paleontology , p. 144.
-sketchfab.com/3d-models/verteb…