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Subject
- Birds11
- Mammals9
- Zoological surveys4
- Animal populations3
- Animals--Identification3
- Biology--Fieldwork3
- Bird populations3
- Scientific expeditions3
- Birds--Ecology2
- Birds--Habitat2
- Mountain animals2
- Mountain ecology2
- Mountains2
- Voyages and travels2
- Amphibians1
- Animal diversity1
- Bird populations--Estimates1
- Birds--Behavior1
- Birds--Migration1
- Fishes1