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Subject
- Birds[remove]13
- Zoological specimens5
- Biology--Fieldwork4
- Bird populations4
- Mammals4
- Zoological surveys4
- Animal populations3
- Birds--Ecology3
- Scientific expeditions2
- Amphibians1
- Animal traps1
- Animals--Identification1
- Art1
- Artists1
- Artists' preparatory studies1
- Bird populations--Estimates1
- Bird trapping1
- Birds--Behavior1
- Birds--Habitat1
- Canyon wren1