According to scientists, there are several reasons why dinosaurs became extinct, but birds were able to survive and reproduce throughout the planet. 
Do you think this baby looks like a real dinosaur? Looking at this blue heron chick, you begin to notice features that have been passed down from dinosaurs to modern birds. 
The hypothesis of the origin of birds from dinosaurs is now the main one in modern science.
Look, for example, at the skeleton of a goose, which clearly resembles a dinosaur. The bones are hollow, the characteristic structure of the legs. There is no large tail, like dinosaurs. But it was reduced in the course of natural selection. Birds benefit from having a feathered tail to maneuver during flight. 
The most striking example of a bird ancestor is Archeopteryx, which combined the qualities of both contemporary dinosaurs and birds. 
Archeopteryx
Why did dinosaurs become extinct, but birds were able to survive and reproduce throughout the planet?
Scientists identify three main reasons. The first is that birds were not so selective in food; many of them were omnivores. This is very important for the conditions that prevailed on the planet at that time. There is an acute shortage of both plant and animal food. The second reason is dimensions. The birds are quite compact; they do not need much to feed themselves. 
The third reason is that birds grew beaks instead of teeth. And they were able to effectively feed on grains, which were unavailable to dinosaurs because they damaged their teeth. And the seeds were stored in the soil for a long time and the birds always had the necessary food at hand. More precisely, under the beak. 
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