Animals don't have a defined morality (low consciousness morality), so adult humans that don't have morality are like animals. Human babies don't have morality but they are naturally learning (or self-learning) it to became moral adults (if everything works well!). Some adult humans fail the very basic of good morality, like to have a good intention in their hearts! Some people (including teenagers) just follow impulses; they don't get it that, because you can do something, it doesn't mean that it is the correct action!
Related topic: Self-preservation >>647, Think before you act >>1009