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Raptor species' global populations (1 Viewer)

I've been trying, so far unsuccessfully, to find out the estimated global populations of the following species:
  • Harris hawk Parabuteo unicinctus
  • Red-tailed hawk Buteo jamaicensis
  • Lanner falcon Falco biarmicus
  • American kestrel Falco sparverius
  • Black vulture Coragyps atratus
  • White-backed vulture Gyps africanus
  • Bald eagle Haliaeetus leucocephalus
  • Northern harrier Circus hudsonius
If anyone knows where I can find this info, it would be much appreciated.

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