The green anaconda is the world's heaviest and one of the world's longest snakes, reaching 5. 21 m (17. 1 ft) long. More typical mature specimens reportedly can range up to 5 m (16. 4 ft), with the females, around a mean length of 4. 6 m (15. 1 ft), being generally much larger in adulthood than the males, which average around 3 m (9. 8 ft). Weights are less well studied, though reportedly range from 30 to 70 kg (66 to 154 lb) in a typical adult. It is the largest snake native to the Americas. Although it is slightly shorter than the reticulated python, it is far more robust; the bulk of a 4. 5-m green anaconda would be comparable to a 7. 4-m reticulated python. Eunectes murinus is probably the heaviest extant species of snake or squamate in the world, perhaps only rivaled by the Komodo dragon. Reports of anacondas 35–40 ft or even longer also exist, but such claims must be regarded with caution, as no specimens of such lengths have ever been deposited in a museum and hard evidence is lacking. A $50,000 cash reward is offered for anyone who can catch an anaconda 30 ft (9. 1 m) or longer, but the prize has not been claimed yet. The longest (and heaviest) verified specimen encountered by Dr. Jesús Antonio Rivas, who had examined more than a thousand anacondas, was a female measuring 5. 21 m (17. 1 ft) long and weighing 97. 5 kg (215 lb).