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- natural history (3)
- nature (3)
- forest ecology (2)
- symbiosis (2)
- trees (2)
- 研究 (2)
- animal behavior (1)
- animal-plant relationships (1)
- animals (1)
- biotic communities (1)
- body size (1)
- conservation of natural resources (1)
- creative ability in children (1)
- diaries (1)
- earth (planet) (1)
- earth sciences (1)
- ecology (1)
- eggs (1)
- fly tying (1)
- food chains (ecology) (1)
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