Conspiracy Theory Research - Dinosaurs

I was still uncertain about my moon topic so I decided to explore some conspiracy/myth ideas for the dinosaurs. 

Humans lived alongside dinosaurs -Dinosaurs and people coexist only in books, movies and cartoons. The last dinosaurs - other than birds - died out dramatically about 65 million years ago, while the fossils of our earliest human ancestors are only about 6 million years old.

Dinosaurs died out because mammals ate their eggs - Dinosaurs coexisted with mammals for 150 million years. Although dinosaur nests were undoubtedly vulnerable, the most dangerous predators were probably smaller dinosaurs. Most mammals of the time were probably too small to eat the eggs of large dinosaurs.

An asteroid impact alone killed the dinosaurs - A layer of iridium-rich rock marks the impact 65 million years ago of a 10-kilometre asteroid in shallow water covering what is now Mexico's Yucatan peninsula. That impact formed the 180 kilometre-wide Chicxulub crater. There is no convincing evidence that any non-avian dinosaurs survived the aftermath of the impact. Yet we are still not totally sure how the dinosaurs died. 

The impact itself could only have killed the dinosaurs in the immediate vicinity of the crater. But it also produced devastating after-effects including giant tsunamis, rain that may have been as acidic as battery acid, and clouds of dust that darkened and cooled the globe for months or even decades.

Another theory suggests that before the impact, dinosaurs were already dwindling as falling sea levels and volcanic eruptions took their toll. A combination of those effects probably wiped out the dinosaurs.

http://www.newscientist.com/article/dn9936-top-10-dinosaur-myths.html#.U-SKuVZKYpE

The dinosaurs went extinct because they became "too big." - This one has some truth to it, with an important qualification. The 20-ton titanosaurs living at the end of the Cretaceous period would have had to eat hundreds of pounds of vegetation every day, putting them at a distinct disadvantage when plants withered and died from lack of sunlight (and also crimping the style of the multi-ton tyrannosaurs that preyed on the titanosaurs). But dinosaurs weren't "punished" by some supernatural force for growing too big, too complacent and too self-satisfied, as some biblically minded moralists continue to claim.

The dinosaurs were rendered extinct by insects/bacteria/aliens. - While it's true that disease-spreading insects may have hastened the demise of the dinosaurs, after they were already weakened by cold and hunger, no reputable scientist believes that the K/T meteor impact had a lesser effect on dinosaurs than million of pesky mosquitoes or new strains of bacteria. As for theories involving aliens, time travel or warps in the space-time continuum, that's grist for Hollywood producers, not serious, working scientists.

http://dinosaurs.about.com/od/dinosaurextinction/a/extinctionmyths.htm