One day, rats higher than cows may occupy a significant part of the Earth's, this enormous growth population of the species predicts University of Leicester (United Kingdom) scientist Dr Jan Zalasiewicz.
Intimidated scenario could become a reality when the time come for large mammals become extinct.
Animals evolve over time and obtain a form, which will give them the most likely to survive and produce offspring.
For example, in the Cretaceous period dominated by giant dinosaurs, now mammals dominate in the planet - in that period there is was very small in the size of a mouse or a rat.
This was because the dinosaurs were occupied larger ecological niches. And only then, when the dinosaurs died out, mammals began to evolve into a set of different shapes.
In the absence of mammals, there will be a free ecological niche. If there had been enough time, rats, perhaps comparable to the size of Capybara (largest rodent on the planet, with an adult individual can weigh 80 kg).
And mammals are, in fact, gradually disappearing in our contaminated planet.
Leaving suddenly empty ecological niche, where rats possibly grow even larger than the bus. Says scientist Dr. Jan Zalasiewicz.
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