What other hypotheses are there about the origin of birds?

The study of the origin of birds is one of the important topics in paleontology and evolutionary biology, and is of great significance to understanding the evolutionary history of birds and their relationship with other animals. In addition to the current theory of dinosaur evolution, there are other hypotheses about the origin of birds, including:

Pterosaur hypothesis: This hypothesis suggests that birds may have originated from some extinct pterosaur-like dinosaurs. Pterosaurs are a group of ancient reptiles that lived in the Jurassic and Cretaceous periods and had wing membranes, but are not directly related to birds. This hypothesis suggests that some pterosaurs may have gradually developed bird-specific characteristics during their evolution, eventually evolving into modern birds.

Proto-reptilian hypothesis: This hypothesis suggests that birds descended from some early reptiles rather than dinosaurs. According to this hypothesis, some primitive reptiles may have gradually developed the ability to fly during their evolution and eventually evolved into modern birds.

Terrestrial Origin Hypothesis: This hypothesis suggests that birds may have originated from some dinosaurs or reptiles that lived on the ground. These animals may have gradually developed the ability to fly through a series of evolutionary processes, and eventually evolved into modern birds.

These hypotheses are based on fossil records and modern biological research. Although they are controversial in some aspects, they all provide valuable ideas and hypotheses for our understanding of the evolutionary history of birds. With the continuous advancement of science and technology, our understanding of the origin of birds is constantly being improved and updated.

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