samanyam etat pasubhih naranam .
dharmo hi tesam adhiko viseso .
dharmena hina pasubhih samanah .
Four common things for animals and human beings.
1.Ahara- eating .
2.Nidra - sleeping .
3.Bhayam- having shelter or house for protection from fear.
4. Maithunam- Sex .
Extra quality with human beings is the dharma or his duty to inquire about the absolute truth or God. The dharma of every human being is to understand what he is, who God is, the relationship between him and God,and to engage in rendering loving service to God.
Therefore a human being is superior than animals only when they inquire about the Absolute truth,otherwise they are considered just like animals.