The emergence of mammals and the diversification of bird species led to increased competition for resources. Large flying animals require substantial amounts of food to sustain their energy-demanding flight, and with increased competition, it became harder for them to find enough food to support their size.
Additionally, changes in climate and atmospheric conditions have influenced the ability of animals to fly. The size and structure of an animal’s wings must be adapted to suit the specific environmental conditions. As the climate changed, ecosystems transformed, and atmospheric dynamics shifted, it became less advantageous for animals to evolve and maintain large sizes for efficient flight.
Physics also plays a role in limiting the size of flying animals. The principles of aerodynamics and the physical constraints of materials restrict the maximum size and weight an animal can be while remaining capable of flight. The larger an animal gets, the more difficult it becomes to generate sufficient lift and maneuver in the air. Additionally, the structural integrity of an animal’s bones and wings becomes increasingly challenging to maintain as size increases.
It’s just not beneficial in any way for them to get that big.
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