Intelligence.

There are varying degrees or levels of 'intelligence' in animals.

1. Those that are conscious of themselves and know that they are alive.

2, Those that can decision make, like a group of Ants.

3. Those that can manipulate or 'play' with objects, like dogs or cats.

4. Those that can use 'tools', modify there behaviour, communicate using a language, and advance in terms of techology and science or the arts, by teaching their young, through the generations, like man.