What are symptoms of intelligence? A sense of discrimination is one attribute.
To  contemplate and endeavour to understand life , and ultimately be able to understand the difference between  body ,mind ,intelligence, and consciousness is the  great Vedic science , and this , the Vedas say is the greatest display of intelligence.

Having some abilities in this science  of self realisation opens the door to unlimited possibilities and unlocks  unlimited potential. Perhaps the end of our endless wonderings within the universal material energies will be in sight.
The dumbed down Darwinian makes no such distinctions , scientific materialism fills their brains , they think consciousness is caused by neurons firing , instead of consciousness causing neurons to fire .

Their intelligence filled with speculative scientific materialism theories,  that they  present as fact based theory , in   educational systems world wide , even small children are shown pictures of apes turning in to mean , via supposed transitions that don’t exist , or they are taken to the scientific museum in London and as soon as they walk in they are bombarded by Darwinians speculative macro evolution guessing, in one huge theatrical show  , ask them to build one blade of grass from scratch,  they are clueless,  what to speak of mind , intelligence, and consciousness..
But at least they can detect and identify intelligence..
Microbial intelligence (known as bacterial intelligence) is the intelligence shown by microorganisms. The concept encompasses complex adaptive behaviour shown by single cells and altruistic or cooperative behaviour in populations of like or unlike cells mediated by chemical signalling that induces physiological or behavioural changes in cells and influences colony structures. This indicates consciousness within the microbe ,his flash in the pan life feels satisfying, time is relative,  as Einstein pointed out .
http://www.thevedicspectator.com

Further,  further..