Cattle and horses, where introduced, are found to degenerate rather rapidly unless the supply of fresh stock is kept up. Birds are more numerous than mammals, among the most important kinds being the pigeons and doves, especially the fruit-eating pigeons.
There are four species of large fruit-eating bats, called flying foxes, twenty of insect-eating bats, above twenty of land-rats, and five of water-rats.
The fruit-eating savage cannot stray beyond his woods which bound his life as the water bounds that of a fish; the hunter is free to live on the margin of forests or in open country, while the robber or warrior from some natural stronghold of the mountains sweeps over the adjacent plains and carries his raids into distant lands.
When first seen by Europeans it contained no mammals except a large fruit-eating bat (Pteropus vulgaris), which is plentiful in the woods; but several mammals have been introduced, and are now numerous in the uncultivated region.