Answer:
basically very cold areas
I would say a natural disaster like a forest fire that could kill trees that are their homes. A forest fire could kill the trees and also the cones they eat for food and thus destroy their habitat and also a source of food and the branches they use to travel from one tree to another in the upper stories of the forest.
The horizon is always always always always ALWAYS 90˚ above the zenith.
Answer: The answer is Israel.