Environmental Changes
10,000,000 years ago, Planet Arda was under an Ice Age. The Arctic Owl, it now living in the arctic tundra and being able to live under extreme cold temperatures would most likely live in the Daidelos Ice Cap. In Image 1 you can see that most of the ice cap borders the northern area of Valmor and Beleriand. Very little (compared to the other areas) have snow caps at the tips of the land. Be careful not to mistake the Daidelos Ice Cap areas with the Chaparral areas. When it was around 95,000,000 years ago, nice sheets of ice were beginning to grow bigger and bigger expanding the Tundra regions from the polar regions. Glaciers in the mountains also began to grow. Now, moving on 9,000,000 years ago there was more volcanic eruptions which meant Global Warming. Because of this the ice sheets began to slowly melt. One million years later there was more Global Warming and by this time all of the ice sheets had melted.
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Impact
As you can see in the comparison above much of the ice cap is gone. 4 million years ago the ice sheets still there were the extremely small highland islands. This hugely impacts the interactions the arctic owl comes across because some of the resources that lives on the ice caps are probably having to adapt to something new or are dead/extinct. These predators or prey that were able to migrate to new areas before the ice cap melted almost completely would have to adjust to new settings like the climates of the grasslands and taiga. Potential predators and prey could have been removed when the ice caps were so now there could possibly a less predator or a prey of the snowy owl.