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Subject
- Aboriginal Australians1
- Acadian flycatcher1
- Acclimatization1
- Adaptation1
- Adaptation (Biology)6
- Adaptation, Biological1
- Adopted children1
- Africans3
- Agelaius phoeniceus1
- American kestrel1
- Analysis1
- Anas clypeata1
- Anatidae1
- Anatomy2
- Anatomy, Comparative1
- Animal Feed1
- Animal Feeds1
- Animal Migration1
- Animal behavior15
- Animal communication4