Probably because many of the missing animals are also caused by many factors and among others their formerly green areas are now standing factories and many trees are cut down so many animals are so shabby that they have to leave this place and find a suitable place to they live.
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You are right, I think this is also one of the factors why they should move. I still remember our childhood every morning in the parrots by birds chirping but now we are awakened by the sound of vehicles.