8Dinosaurs died out because mammals ate their eggsMatt Weber: August 19, 2013 | 58,130 views
The Myth: 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.
7An asteroid impact alone killed the dinosaurs
The Myth: 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.