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- Rabbits 2
- Rachycentridae 1
- Rachycentron canadum 1
- Radiometric samples 1
- Radiometric studies 1
- Rails 1
- Rainbow 1
- Rallidae 1
- Ramonia 1
- Ramonia azorica 1
- Ramularia destructiva 1
- Rana esculenta 1
- Ranellidae 1
- Range extensions 1
- Rannelid gastropod 1
- Ranunculaceae 1
- Raphidrilus nemasoma 1
- Rare plants 1
- Rarity 4
- Recapture 2