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Subjects
- Books26
- Emotions -- physiology13
- Facial Expression10
- Biological Evolution9
- Sex Characteristics8
- Genetic Variation6
- Birds5
- Columbidae5
- Dogs5
- Aggression -- physiology4
- Pigmentation4
- Chickens3
- Feathers -- anatomy & histology3
- Hominidae3
- Reptiles3
- Adaptation, Biological2
- Anthropology, Physical2
- Attention -- physiology2
- Beagle (Ship)2
- Birds -- anatomy & histology2