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This is a list of the mammal species recorded on Christmas Island. The island had five native and endemic land mammal species, of which four are now believed to be extinct. In addition, five exotic wild mammals have been introduced to Christmas Island.
Rodentia
At the time of human settlement, Christmas Island hosted two endemic rodents, the bulldog rat and Maclear's rat. However, both species were extinct by 1908. There is evidence that black rats, introduced to the island in 1899, carried the infectious parasite Trypanosoma lewisi, which was fatal to the native rodents.
References
List of mammals of Christmas Island Wikipedia(Text) CC BY-SA