Species

The Mariana Fruit Bat (or Mariana Flying Fox)

Pteropus P. Mariannus from the family of Pteropodidae.

Examples of other organisms in its family: 

Philippine Dawn Bat, Large Samoan Flying Fox, Pygmy Fruit Bat, Swift Fruit Bat, etc...

How it came to the CNMI: 

Some scientists predict that its ancestors might have migrated from the West (i.e: Asia).

Sources: 

http://www.iucnredlist.org/details/18737/0 

http://en.wikipedia.org/wiki/Megabat