Human beings are notably more complex then other lifeforms on this earth, but complex does not mean 'intelligent' (a common mistake) and it does not mean 'highly evolved' (another common mistake).
Take an elephant. Elephants feel remorse, they grieve for their dead, they get revenge, they shed tears amongst many other human emotions and personality traits. The only things really seperating the two, other than physical structure of course, is that humans do not have any natural defence mechanisms, elephants skin is tough and protective, and elephants are not wiping off every species upon the earth, probably because elephants, though they feel wrath, pride, remorse and many other emotions, do not feel 'greed' which is a completely human emotions and is responsible for destroying our own earth.
It takes a 'complex' mind to create the various amonuts of technology humans have produced over the centuries. What has our so-called intelligence done? Destroyed the waters, skies, forests and life of our own Mother. Is that an intelligent thing to do? On top of that, many humans are ignorant to the fact we are almost COMPLETELY responsible for the tragedies that occur. So, who really chose to link up complex with intelligent?
An elephant doesn't know the alphabet, and it doesn't make radiation filled phone calls to the elephants in Asia, and it doesn't microwave it's food, letting out yet more radiation. With a brain that size, and it's memory almost equal to that of a human beings, I'm sure if an elephant really saw a decent POINT in learning and using these things, he probably could learn. They've taught elephants to do all sorts of things in their cruel 'I own everything ont his planet' act. But I think the elephnat knows that is kind of pathetic to have all these 'convenient' eart destroying products, when he could just as easily continue doing things as he's always done. Elephants haven't changed much since their first step on earth. Why not? Is it because their not intelligent and greedy enough to destroy their home? Is it because they're humle enough to find comfort and happiness in NOT ruling the world? Or is it truely because they're stupid?
Cockroaches are immune to most chemicals and natural diseases on this plantet, fleas can live on object surfaces for months without starving to death, most insects can freeze themselves and be unfrozen years later, still perfectly cabale of life, and most mammals can go into a hibernation period, meerly living off their body fat for months. Humans are vunerable to nearly everything on the planet, can't go for more than a week tops without food, but most can't even go without three lare meals a day, would die of hypothermia if their bodies came in contact with freezing temperatures, and couldn't ever go to sleep for more than a couple of days after a drug binge.
Drop a human anywhere in the world, naked, as he is naturally, and without his guns and his knives, as he is naturally, and anything would kill him. He wouldn't last one minute, being a weak, naked ape with nothing to defend himself with besides his brain. He is so weak, that he must rely in technology to save his pathetic skin, and in consequence of this, kill not only all of the flora anf fauna across the ENTIRE world (Because unlike other creatures, they can't be happy having just one habitat), but also their own species.
If "complex" comes with a consequence of destroying the place that we live in, the plants and animals we eat, and the water we drink, we'd be a lot better of being 'simple-minded', just as we believe every other living thing to be, and allow nature to quickly kill us off.
We are not themost "highly evolved" creature on this planet. And if that stupid, incorrect term MUST be used at all, I'd say we were the least evolved creature on this planet. Our technology is evolved, but we are not, whatsoever.