Subject
- Birds--Ecology[remove]27
- Birds26
- Birds--Habitat12
- Birds--Nests12
- Nests9
- Bird populations7
- Birds--Eggs7
- Water birds7
- Cormorants6
- Zoological surveys6
- Biology--Fieldwork5
- Double-crested cormorant5
- Animal populations2
- Animals--Food2
- Corvidae2
- Trumpeter swan2
- American black oystercatcher1
- American coot1
- Animal diversity1
- Animals--Infancy1
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