Around 65 million years ago the mighty Dinosaur ruled planet Earth. Their sheer size and ferocity made their removal unthinkable. There wasn't anything or anyone, who could challenge them physically or, at that time, mentally.
Approximately 160 million years before that, another group of Dinosaurs had roamed the planet and disappeared albeit without the same level of dominance.
Circa 65 million years ago an asteroid paid a visit to Yucatan, Mexico and the unthinkable became the reality.
It struck the ground with such force and from an oblique angle which resulted in clouds of mud and dust being thrown up and into the sky. Clouds which blocked out the Sun and created major climatic shifts.
The Dinosaur and many other species became extinct as freezing temperatures and pitch black conditions grew unmanageable.
This was by no means the last time that a species grew, prospered and dominated over the next 65 million years. Birds, beasts and of a wide variety came and went for many different reasons. Some adapted as the Earth evolved, to the many changes, while others died out.
Each dominant species in it's turn was overtaken by circumstances which eliminated it. If it wasn't an asteroid it was an Ice-Age or an El Nino phenomena which deprived them of food.
The common denominator is the fact that without an element of fault, involving factors beyond their control, they were not only removed from top spot but wiped out completely.
Then along came man. Tracing back to apes which were walking upright 1,5 million years ago, the species evolved into the thinking individuals we are today.
The early forms had learned to walk upright as a result of a need to see over long grass. The habit became the reality. At this time the apes were very much the prey as well as, to a limited degree, hunters.
The forming of "family" or tribal units and the ability to think ahead or plan were to be key in the development of the species as the dominant on the planet.
If we consider that we are slower than almost all other animals and certainly physically weaker than most, then it is these abilities to plan for weapons, shelter and strategy as well as act in groups which has given us the edge.
And this has developed to today's nuclear power, computers linking the planet and weapons of mass destruction.
The human race has developed to the point that our destruction is almost unthinkable.
YEAH RIGHT!!! :0)