Dr. Phillips, who heads the study, noted that when the dinosaurs disappeared 65 million years ago, the predators lost ground ecosystems, and there were plenty of food sources. For modern flightless ancestors such as ostriches, cassowaries, cassowaries, and tadpoles, they will not have to fly in the air to escape predators quickly. They can choose to live on the ground, and their abundant food sources make them bigger and bigger, and eventually they cannot fly in the air. According to Dr. Phillips, because bird wings consume a lot of energy when flying, during this period, they are more inclined to choose to live on land to find food. Phillips and team members studied DNA fossils of flightless birds, including the extinct New Zealand fearbird, and other modern ancestors of large flightless birds. They found that the most recent relationship between fear birds is a small bird that still lives on the ground today. They are called tinamous. They still live in South America today and the
y are still unable to fly in the air. Analysis of the DNA molecule of the fear bird fossil sample shows that the ancestor of the fear bird became flightless during the same period of dinosaur extinction. A turning point in evolution. Antarctica, New Zealand, Australia, Africa, and the South American continent were all connected during the Cretaceous period (145-65 million years ago) where the phoenix ancestors lived, at the time known as Gondwana. As the movement of the Earth’s plates changed, continents began to drift away, and New Zealand separated from the Gondwana Land about 80 million years ago. This latest study shows that the evolution of birds in different continent plates was isolated, rather than what they previously thought were all derived from a single non-flying ancestor of Gondwana ancient land. At the same time, the study also explains the historical problem of non-flying birds, revealing how they are distributed across different continental plates. The latest study is currently published in the January issue of the journal Systems Biology.