The Macaca fascicularis, or Crab-eating Macaques were first released in Anguar in the early 1900’s by German phosphate mining engineers. Now these primates extend throughout Southeast Asian, including Palau.
They are of least concern for endangerment, but they are do become a threat to the ecosystems as their ability to survive any environment and little threat from predators helps them to expand their populations rapidly and overtake the natural forest habitat.
The Polynesian Rat or, Rattus exculans, in the Muridae family is widespread throughout South-east Asia and are considered an abundant species. They are present in a wide variety of habitats. This includes both disturbed or agricultural land—they are usually most present in disturbed forests. They are nocturnal and can often be considered a commensal species. There are no major threats to this rat because they live in protected areas.