Polynesian rat

The third most widespread rat on Earth, after the brown rat and black rat

Forest and Kim Starr


Polynesian rat

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The third most widespread rat on Earth, after the brown rat and black rat

Population

A small, slim rat with a pointed nose, big, round ears, and a long, fine tail that’s about as long as its body. Its fur is usually brown to grey-brown on top with a lighter belly, so it blends in well with dry leaves and tree bark. Compared with the big city rats most people think of, the Polynesian rat is more “pocket-sized”. It is active mostly at night, slipping through grass, scrambling over rocks, and racing up trees with ease. By day, it rests in burrows, grass nests, tree hollows, or any other snug hiding place it can find, often close to where people live, farm, or store food.

What makes this rat especially interesting is how closely its story is tied to humans. It originally came from Southeast Asia, but it spread across the Pacific as a stowaway in voyaging canoes, travelling with early settlers to places like New Zealand, Hawaii, and Easter Island. Wherever people went, carrying crops and supplies, the rats came too. Because they can’t swim long distances, finding Polynesian rat bones in old sites helps scientists trace ancient sea routes and understand when different islands were first settled.

The Polynesian rat is an adventurous eater with a very mixed menu. It happily chews seeds, fruits, roots, leaves and bark, but will also hunt insects, worms, spiders, lizards and, when it can, bird eggs and chicks. One of its quirkiest habits is the use of “husking stations.” Instead of eating where it finds food, it often carries seeds or nuts to a favourite safe spot, such as under tree roots, in a rock crack or under palm fronds. There it calmly peels, shells or nibbles its prize without worrying too much about rain or rivals. Over time, these little feeding sites build up piles of neatly opened seeds, like a tiny picnic corner that gives away the rat’s secret life.

Distribution

Country
Population est.
Status
Year
Comments
American Samoa
2016
Introduced
Bangladesh
2016
Brunei
2016
Introduced
Cambodia
2016
Christmas Island
2016
Introduced
Cocos Is. (Keeling)
2016
Introduced
Cook Islands
2016
Introduced
East Timor
2016
Introduced
Fiji
2016
Introduced
French Polynesia
2016
Introduced
Guam
2016
Introduced
Indonesia
2016
Kiribati
2016
Introduced
Laos
2016
Malaysia
2016
Marshall Islands
2016
Introduced
Micronesia
2016
Introduced
Myanmar
2016
Nauru
2016
Introduced
New Caledonia
2016
Introduced
New Zealand
2016
Introduced
Niue
2016
Introduced
Norfolk Island
2016
Introduced
Nort. Mariana Is.
2016
Introduced
Palau
2016
Introduced
Papua New Guinea
2016
Introduced
Philippines
2016
Introduced
Samoa
2016
Introduced
Singapore
2016
Introduced
Solomon Islands
2016
Introduced
Taiwan
2016
Origin Uncertain
Thailand
2016
Tokelau
2016
Introduced
Tonga
2016
Introduced
Tuvalu
2016
Introduced
US Minor Is.
2016
Introduced
United States
2016
Introduced: Hawaiian Is.
Vanuatu
2016
Introduced
Vietnam
2016
Wallis & Futuna
2016
Introduced

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Terrestrial / Aquatic

Altricial / Precocial

Polygamous / Monogamous

Dimorphic (size) / Monomorphic

Active: Diurnal / Nocturnal

Social behavior: Solitary / Pack / Herd

Diet: Carnivore / Herbivore / Omnivore / Piscivorous / Insectivore

Migratory: Yes / No

Domesticated: Yes / No

Dangerous: Yes / No