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This is a list of taxa whose location or distribution is notably difficult to explain; e.g., species which came to occupy a range distant from that of their closest relatives by a process or history that is not understood, or is a subject of controversy.

Specific taxa

• Mammals
  • Falkland Islands wolf ^[1]
  • Gansu mole
  • Pennant's colobus
• Birds
  • Elephant birds
  • Moa
  • Nicobar megapode
• Reptiles
  • Brachylophus^{[ citation needed]}
  • Lapitiguana^{[ citation needed]}
  • Phelsuma andamanense ^[2]

Assemblages of taxa

• Lusitanian flora

References