Why do birds have no teeth?

The birds currently living on Earth have no teeth. Let's find out the cause and discover this interesting truth.

First, let's go back to the time period 65 million years ago. At that time, a giant meteorite collided with the Earth and caused a major extinction. Because, after this event, about 17% of them, 50% of genera and 75% of species have completely disappeared on the green planet.

In addition, this event also ended the domination period of the giant dinosaurs such as Tyrannosaurus (Tyrannosaurus) or Triceratops (genus 3 horns) . Even at that time, The catastrophe caused the Earth to become extremely scary with acid rain, the atmosphere being polluted by volcanic smoke and dust.

However, this opens the way for the development of mammals, toothed birds and ancestors of the current bird (Maniraptoran subgroup - dinosaurs including birds) become the rulers on the ground at that time.

The last ancestor of birds has now escaped extinction through the grain diet, and the tooth-and-carnivorous fellow is extinct due to scarcity of food.

However, in the transition period from the Cretaceous period to the Paleogen period (Co Jin century), all birds with teeth suddenly died. According to a study by a group of scientists led by MSc Derek Larson of the University of Toronto (Canada), the cause of this is due to scarce food sources, causing the species to have teeth and eating meat to perish Only the species with beaks, teeth, and seeds that survive as the ancestors of the current birds survive.

To demonstrate this, the above-mentioned scientific team conducted research on 3,104 tooth samples from four Maniraptoran groups excavated throughout western North America. After the study, scientists concluded that the diet of toothed birds is meat , so under food scarcity because the Earth is contaminated , these species certainly do not have a chance. to survive.

Meanwhile, toothless birds, mines and they can eat nuts. That helps them get rid of the doom."The dinosaurs of the Maniraptoran group have lived very well through 18 million years until the end of the Cretaceous period. Here, the birds with teeth have abruptly died because of no food source" - Master Derek Larson said know.

Thus, the current birds do not have teeth because their ancestors survived the extinction due to the grain diet. If they have small teeth and eat meat, they will become extinct like the teeth of the Maniraptoran group and there will be no birds like today.

The study was published in the journal Current Biology last weekend.