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Subject
- Birds8
- Mammals5
- Bird populations4
- Zoological surveys4
- Animal populations3
- Biology--Fieldwork3
- Birds--Ecology3
- Scientific expeditions3
- Animals--Identification2
- Zoological specimens2
- Amphibians1
- Bird populations--Estimates1
- Birds--Behavior1
- Birds--Habitat1
- Deer1
- Deer--Habitat1
- Ducks1
- Mule deer1
- Mule deer--Ecology1
- Urban animals1