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Subject
- Birds5
- Zoological surveys[remove]5
- Biology--Fieldwork4
- Mammals4
- Scientific expeditions3
- Voyages and travels3
- Bird populations2
- Animal diversity1
- Animal populations1
- Bird populations--Estimates1
- Birds--Ecology1
- Birds--Habitat1
- Fishes1
- Invertebrates1
- Mammal populations1
- Mountain animals1
- Mountain ecology1
- Mountains1
- Summer1