1. An intelligent species must be living.

2. An intelligent species must possess a thought process.

3. An intelligent species must have the ability to move. If you don't move you don't need intelligence.

4.Sensors to obtain information from their surroundings.

The object of the thought process is to guide our actions to benefit us. When you use a thought process to create action you get intelligence. The definition of intelligence is:

ACTION PROCEEDED BY A THOUGHT PROCESS.

From the lowest form of intelligence to the highest, we humans, the actions you take demonstrate your level of intelligence.