A Few Questions on the Definition of "Exploration"

So I searched 'Exploration", and found the following definition  on Wikipedia:

"Exploration is the act of searching or traveling around a terrain (including space, seespace exploration) for the purpose of discovery of resources or information. Exploration occurs in all non-sessile animal species, including humans."

So that means that I wont have to do any more interviews with mature, sessile barnacles. 

But this definition doesn't go to the heart of the issue for me, because I am interested in Why We Behaviorally Modern Humans Explore, and I'm not satisfied with the answer being that its part of our genetic code.

Although that's exactly what Astrobiologist  Nathalie Cabrol said when I asked her Why We Explore. She's convinced that the very first form of life that existed in the universe immediately set out exploring, and that every one of its descendants, continued to refine and hone exploration  skills, including us.

Just not the 'Sessile" ones, according to Wikipedia...

So Google defines Exploration as;ex·plo·ra·tion  /ˌekspləˈrāSHən/
Noun

1. The action of traveling in or through an unfamiliar area in order to learn about it.
2. Thorough analysis of a subject or theme.

I'm ok with that definition, But my next question might be; What is an Explorer?