Personally, I have no doubt that the human species is very-very old on Earth. This article brings evidence that humans were here long before dinosaurs (at least 30 - 400 million years before, according to the final chapter), long before any animals or birds existed. The humans had later co-existed with them all.
 
I also have no doubt that extraterrestrial species interfered in our evolution. All major ancient civilizations tell stories of aliens who came to Earth and taught them everything they knew...and they knew a lot (they were better than we are today in: astronomy and constructions and at least as good as we are in tens of other domains).
 
The Sumerians, Babylonians, Mayas, Incas, American Indians, Asian Indians, African tribes, Egyptians, the first Chinese & Japanese, etc., ALL have written or spoken 'legends' regarding extraterrestrials and their intervention in our evolution.

http://humansarefree.com/2011/04/amazing-evidence-human-specie-is.html

http://www.sott.net/articles/show/243634-How-to-Use-Light-to-Control-the-Brain

http://www.physorg.com/news/2012-04-lenses.html