Below we offer you the different theories that have been shuffled over the years to try to explain the reason for the extinction of the dinosaurs, an unknown that has accompanied man for thousands of years. As you can see, these assumptions are very diverse. Here we show you some of the best known explanations.
This theory suggests that a mysterious disease will kill the entire set of dinosaurs. But this possibility lacks consistency because it is not possible that there is a virus, microbes or other infections that are capable of reaching a set of a class of animals such as dinosaurs. These infections are usually limited to a few closely related species.
Nor would this approach explain why none of the mammalian species was affected by these epidemics. Other reptiles, such as crocodiles, turtles, and lizards, did survive the pests.
This theory holds that the earth grew cold (for an unspecified reason) and that the dinosaurs were unable to adapt to the cold and became extinct. But with this theory it is still very difficult to explain that it affected all kinds of dinosaurs and, on the contrary, it did not affect other animals such as turtles, crocodiles and other sharks.
In addition, this theory is disarmed by showing that dinosaurs existed in polar regions that were accustomed to cold. Therefore, the latter, faced with the possibility of climate change, would have survived.
Competition with other mammals and poor intelligence
This theory is supported by the small size of the brains of dinosaurs, compared to their large body dimensions. In addition, they were very slow and heavy animals. According to this possibility, due to these characteristics, dinosaurs were unable to compete with mammals that were more agile and faster.
This theory lacks weight when attesting that there were dinosaurs that did have a large brain regarding their proportions (Ex: deinonicosaurs). In addition, there were others who had great agility and speed, such as the tetanuranidae. In addition, the mammals of that time had an equally very small brain.
Mammals that devour their eggs
According to this hypothesis, dinosaurs become extinct because their eggs have been devoured by small nocturnal mammals. The hypothesis is supported by the fact that in the investigations carried out over the years, fossilized dinosaur eggs have been found that seemed to have been opened and emptied.
This theory is unfounded since it has been scientifically proven that dinosaurs and mammals have coexisted for millions of years. Furthermore, it does not explain how mammals devoured only dinosaur eggs and only theirs.
That is, why didn’t they also devour the eggs of other mammals, such as oviparous reptiles or birds? This approach also does not explain how mammals could end up with marine dinosaurs that did not lay eggs but gave birth.
A volcanic explosion that destroys the ozone layer
This hypothesis is based on the strong volcanic activity that occurred in the Cretaceous era. Volcanic gases destroyed the ozone layer and as a consequence ultraviolet rays poured into the atmosphere in strong amounts, causing the extinction of the dinosaurs.
This assumption does not explain why all the dinosaurs disappeared en masse, since the beings that lived in the water or those with a strong fur must have survived since they were prepared for those atmospheric conditions.
A meteor hits the Earth
Perhaps the theory that is best known since it has a multitude of followers, although how the previous ones lack total certainty and leave aspects unresolved.
This theory explains that 65 million years ago a meteorite of approximately 10 km. in diameter, it impacted the Earth causing havoc: It
caused large fires (approximately 70% of the continents were on fire). The fire interrupted the photosynthesis of the plants which caused that the oxygen of the planet was reduced almost to the total.
A huge cloud made up of water vapor, rock debris, released gases, metallic elements and dust, spread throughout the stratosphere and blocked the sunlight. As the sun could not penetrate, the temperature dropped to 10 degrees below zero. Lakes freeze and thousands of plant species die. The cloud could be maintained for years, which causes the death of vegetation, herbivores and carnivores. In these adverse conditions, the best able to survive were small animals, scavengers such as lizards, crocodiles, etc.
The main objection to this theory is that nobody has found that crater that the impact of an object the kilometer-long dimensions of the meteorite should have caused. Although many voices have been raised to explain this absence, alleging that continental drift could have made it disappear.