The newly named northern green anaconda or Eunectes akayima is reportedly the largest in the world, capable of exceeding lengths of 20 feet — with anecdotal reports of serpents measuring 25 feet long.
Green anacondas can grow to almost 9m in length and weigh more than 250kg – that's about the weight of a male grizzly bear.
Quick Take Reaching a size 5 times larger than males is a biological benchmark for breeding females. Holding breath for 10 minutes underwater dictates the specific aquatic reach of the green anaconda.