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The new environment is that all. water has risen so monitor lizards have to learn how to swim better so over time there limbs grow longer so they can swim faster and the reason they have bigger teeth and claws is so they can catch and eat their prey faster also some behavioral adaptations are every hour they half to come up for air and they also do not go that deep because the pressure will crush them and they don't bask any more because they only stay in warm water so they don't freeze they also have webbed feet so they swim faster