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animal systems (species interactions (mutualism, commensalism, competition…

- - - - several sources help birds build a map
        
        sound
        
        smells
        
        landmarks
  - - - clock-and-compass orientation
- - - - develop hierarchies within a group to reduce aggression
  - - - introduce a new species (by human activity) may cause extinction
- - - - batesian
        
        harmless animals
      - mullerian
        
        poisonous or dangerous species