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Subject
- Birds9
- Mammals6
- Biology--Fieldwork5
- Zoological surveys4
- Animal populations3
- Bird populations3
- Animal diversity2
- Birds--Ecology2
- Scientific expeditions2
- Voyages and travels2
- Zoological specimens2
- Animals--Identification1
- Birds--Behavior1
- Ducks1
- Islands1
- Muskrat1
- Reindeer1
- Rivers1
- Scientific expeditions--Equipment and supplies1
- Urban animals1