Frans de Waal and Barbara King both view human morality as having grown out of primate sociality.
Though morality awareness may be a unique human trait, many social animals, such as primates, dolphins and whales, have been known to exhibit pre-moral sentiments.
The difference between the comprehension of causality by humans and chimpanzees is one of degree.
The degree of comprehension in an animal depends upon the size of the prefrontal cortex: the greater the size of the prefrontal cortex the deeper the comprehension.
The cerebral neocortex is presumed to be responsible for the neuronal computations underlying complex phenomena such as perception, thought, language, attention, episodic memory and voluntary movement.