Dinosaurs became extinct after the meteor crash on earth which led to the emergence of mammals which were previously nocturnal.
The dinosaurs went extinct after an asteroid entered the earth’s atmosphere nearly 66 million years ago and crashed at a place which is now called Mexico. The asteroid was not the reason for extinction. The crash triggered a series of volcanic eruptions astronomically high tsunami waves which lead to the demise of dinosaurs.
The extinction of dinosaurs was good news for other animals as they for the first time were able to come out of the dark during the daytime. The behavior of mammals changed rapidly and this was a major step towards the evolution of humankind. The mammals were predominantly nocturnal but after the dinosaurs died, they felt safe and came out of the dark to search for food and shelter.
Biologists came to the conclusion that a large majority of ancient mammals were nocturnal because their successors today have advanced night vision, superior hearing and smelling powers. These powers come pretty handy at night.
However, it is still a mystery as to when mammals began exploring the wilderness during the day. Scientists have only fossils at their disposal and it is literally very hard to predict the behavior only from it. Nevertheless, the eye socket and nostril cutouts on the fossils give some idea but they can be misleading.
As a matter of fact, recent studies suggest that a large majority of birds that we see today could be the descendants of T-rex and velociraptors. These dinosaurs weighed between 50 kilograms to 250 kilograms which are substantially higher than the weight of the largest bird alive today. Feathers were a part of dinosaurs’ bodies millions of years ago.
It is pretty clear that birds evolved from t-rex but this evolution did not take place overnight. The first few million years led to the development of wings, then feathers appeared, the next few were the crucial in the development of bipedal locomotion and in the end, the wishbone appeared. Once, the final structure of birds was in place, they began evolving at a significantly faster pace than dinosaurs.
Tetanurans changed to much smaller coelusauraurus, which then shrank to paraves. The paraves had feathered wings, an agile beak, walked on 2 legs but the development of the wishbone was still left. In a few million years, the tail changed to wishbone and birds became a reality.
After the asteroid crash, tree and ground-dwelling birds became history. High flying birds, trees and plants, and insects that survived the crash, probably lived a very hard life. As a matter of fact, a large majority of birds today eat insects and it is very likely that this trait was inculcated in the birds after the extinction of dinosaurs 60 million years ago.
Ostriches and emus are perhaps very closely related to dinosaurs. Their features, body structure, and habits are reminiscent of dinosaurs. Therefore, it can be said that the demise of dinosaurs led to the evolution of birds and the discovery of other mammals which were previously nocturnal.
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