The largest anaconda was reportedly 33 feet long, 3 feet across at its widest part, and weighed about 880 lbs. This snake was discovered at a construction site in Brazil. Unfortunately, it either died in the controlled explosion after which they found the snake or by construction workers after it emerged.

The longest and heaviest verified specimen encountered by Dr. Jesús Antonio Rivas, who had examined more than 1,000 anacondas, was a female 5.21 m (17 ft 1 in) long and weighing 97.5 kg (214 lb 15 oz). In 1937, a specimen shot in Guyana was claimed to have measured 5.9 m (19 ft 4 in) long and weighed 163 kg (359 lb 6 oz).

The world's largest Anaconda was caught in Amazon forest. This snake had eaten 257 people & 2325 animals. It is 134 feet long and 2067 kg. This anaconda was caught alive by a long struggle after 37 days and killed by the Royal British commando force.