The shocking 12-million-year secret behind why anacondas are so huge

The success of the Green Anaconda has been shown to be due to evolutionary stasis since it has been shown that the anaconda lineage reached its giant proportions, as evidenced by paleobiological studies published in leading herpetology journals. The Miocene epoch had the perfect environment for these enormous constrictors to move into the semi-aquatic apex niche, as there were many large, tropical wetlands in which they could live. The Anaconda had essentially stopped evolving through their unique ‘arrested evolution’ strategy; they reached their maximum size for hunting through the use of ambush techniques, and could no longer face any evolutionary pressure to change due to the evolutionary pressures associated with ambush hunting. Therefore, once the anaconda had reached its peak size and had effectively reached the peak of its evolutionary advancement, it had evolved very little. Genetic research stored in the National Centre for Biotechnology Information also supports the idea that once the Green Anaconda reached the ultimate stage of evolution and had no further need to evolve, it would continue to live the same way as it had when it first evolved to its current form. Consequently, this prehistoric resilience allows the modern Green Anaconda to thrive as a living relic, perfectly adapted to its environment with a biological design that has remained virtually unchanged for millions of years.According to the research in NCBI, the origin of Giant Anacondas is from the Miocene Epoch, about 12 to 23 million years ago. During this time, major geological changes took place in South America, creating large stable systems of wetland habitats. Through evidence found in the field of Paleobiology, scientists have concluded that the common ancestor of modern Giant Anacondas (Eunectes murinus) also lived in a wetland habitat, and since a different type of animal (terrestrial) is incapable of attaining such extreme body mass (due to gravity and metabolic limitations), that the Giant Anaconda was able to evolve by taking advantage of being semi-aquatic without limits on growing its body.According to the Smithsonian Tropical Research Institute, the term ‘morphological stasis’ describes how an animal has remained the same or stopped evolving. The evolution of the Giant Anaconda is simply that it reached a state where its size and the environment it occupied reached a perfect balance (in other words, the design of the Giant Anaconda has evolved to an optimum state). The Giant Anaconda has developed into an enormous semi-aquatic ambush predator with the ability to float (and therefore support its weight), and its size allows it to overpower virtually any prey animal that may occupy its environment. As this design has evolved for millions of years and remains the best method for surviving in the Amazon, there has been no evolutionary pressure via natural selection to change the physical form of Giant Anacondas.According to the National Centre for Biotechnology Information (NCBI), genetic data stored in their databases suggests that anaconda's morphology represents a ‘fossilised’ example of a body plan that is still living today. As far as the genomic sequence goes, meaning the anaconda's ancestral genome is similar to that of ancient lineages that lived millions of years ago, there have not been significant or radical changes in genes that control skeletal structure and body mass over the last few million years. Thus, the anaconda appears to have reached a ‘genetic plateau,’ meaning any large genetic mutation would likely compromise the survival fitness of the anaconda to thrive in its specialised wetland habitat.