In scientific sense, humans are the animals, but we are just an evolved form of the animals. We have all the parts that the animals do, but with more developed form. For example, animals can make a sound, but that is not understandable language for us so it is not the idea of what we say "speak".
In cultural sense, animals just take care of their family, literally THEIR FAMILY - blood related or crossbred - only, others are all enemies. It is very different for people. People are warmhearted, we love our neighbours. Some part of the world, family means one whole tribe.
In general sense, humans are having their own opinion and thoughts which animals can't have one or maybe they have but not expressed. There is no specific evidence with that but that is what we pretend as.
In my sense, it is bit more complicated and detailed than what the definition in dictionary that forcing us to save in our brain. Human is not just an animal with 36.5℃ warmth and having individual thoughts. We are human because we have opinion, conscience, mercy, emotion, passion and expression of love. Humans have concept of "understanding", "forgiveness", "consideration", "concern" and "choice". Since, we have these things, we try not to make another person unhappy by our behaviours. When two animals meet, they fight, kill or even try to eat each other.
