Whenever a few members of a population survive after the entire population collapses due to a natural calamity or any other disaster, something amazing happens. These few existing members become the pioneers, or leaders, to re-establish their population in a new place where food, water, and other nutrients required for surviving are available. Most animals had died and so the snakes that survived the asteroid crash didn’t face any competition. With little competition from other animals, they had a blank canvas to branch out along different evolutionary paths and across the world, colonizing Asia for the first time.
Over time, snakes become bigger and more widespread, exploiting new habitats and new prey. New groups of snakes appeared, including giant sea snakes up to 10 meters long.