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Subject
- Bird populations[remove]12
- Birds12
- Biology--Fieldwork9
- Zoological surveys9
- Birds--Ecology7
- Animal populations3
- Mammals3
- Mammal populations2
- Scientific expeditions2
- Zoological specimens2
- Animal diversity1
- Bird populations--Estimates1
- Birds--Behavior1
- Birds--Habitat1
- Islands1
- Mountain animals1
- Mountain ecology1
- Mountains1
- Voyages and travels1