Deer are often tamed and petted, and their flesh is so much esteemed by all Malays, that it is very natural they should endeavour to introduce them into the remote islands in which they settled, and whose luxuriant forests seem so well adapted for their subsistence.
The strange babirusa of Celebes is also found in Bouru; but in no other Moluccan island, and it is somewhat difficult to imagine how it got there.

It is true that there is some approximation between the birds of the Sula Islands (where the babirusa is also found) and those of Bouru, which seems to indicate that these islands have recently been closer together, or that some intervening land has disappeared.

At this time the babirusa may have entered Bouru, since it probably swims as well as its allies the pigs.

These are spread all over the Archipelago, even to several of the smaller islands, and in many cases the species are peculiar.

It is evident, therefore, that they have some natural means of dispersal.