The Malayan field rat, Malaysian field rat or Malaysian wood rat, (''Rattus tiomanicus'') is a species of

rodent Rodents (from Latin , 'to gnaw') are mammals of the Order (biology), order Rodentia ( ), which are characterized by a single pair of continuously growing incisors in each of the upper and Mandible, lower jaws. About 40% of all mammal specie ...

in the family

Muridae The Muridae, or murids, are either the largest or second-largest family of rodents and of mammals, containing approximately 870 species, including many species of mice, rats, and gerbils found naturally throughout Eurasia, Africa, and Australia. ...

. It is nocturnal and mainly arboreal and is found in

Malaysia Malaysia is a country in Southeast Asia. Featuring the Tanjung Piai, southernmost point of continental Eurasia, it is a federation, federal constitutional monarchy consisting of States and federal territories of Malaysia, 13 states and thre ...

Thailand Thailand, officially the Kingdom of Thailand and historically known as Siam (the official name until 1939), is a country in Southeast Asia on the Mainland Southeast Asia, Indochinese Peninsula. With a population of almost 66 million, it spa ...

Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania, between the Indian Ocean, Indian and Pacific Ocean, Pacific oceans. Comprising over List of islands of Indonesia, 17,000 islands, including Sumatra, ...

and the

Philippines The Philippines, officially the Republic of the Philippines, is an Archipelagic state, archipelagic country in Southeast Asia. Located in the western Pacific Ocean, it consists of List of islands of the Philippines, 7,641 islands, with a tot ...

. It is a common species and the

International Union for Conservation of Nature The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the stat ...

has assessed it as being of "

least concern A least-concern species is a species that has been evaluated and categorized by the International Union for Conservation of Nature (IUCN) as not being a focus of wildlife conservation because the specific species is still plentiful in the wil ...

Description

The Malayan field rat has a head-and-body length of and a tail . It has a weight of between . The ears are large and nearly naked. The fur is smooth and flattened, interspersed with short spines. The dorsal

pelage A fur is a soft, thick growth of hair that covers the skin of almost all mammals. It consists of a combination of oily guard hair on top and thick underfur beneath. The guard hair keeps moisture from reaching the skin; the underfur acts as an ...

is a grizzled olive-brown with scattered medium-length black guard hairs, and the underparts are whitish. The tail, which is a similar length to the body, is a uniform dark brown. The feet are broad, and the soles have fine ridges for climbing. It differs from Annandale's rat (''Rattus annandalei'') in having sleek fur with spines and fewer mammae, and from the ricefield rat (''Rattus argentiventer'') in having plain white underparts and lacking an orange spot in front of the ear.

Distribution and habitat

The Malayan field rat is known from Malaysia, Thailand, Sumatra, Borneo, the Philippines and many smaller islands. Its typical habitat is primary and secondary forest, including coastal forest but it is seldom found in

dipterocarp Dipterocarpaceae is a family of flowering plants with 22 genera and about 695 known species of mainly lowland tropical forest trees. Their distribution is pantropical, from northern South America to Africa, the Seychelles, India, Indochina, Indo ...

forests. It is also found in plantations, shrubby areas, grassland and gardens, but seldom invades buildings.

Behaviour

The Malayan field rat is nocturnal. It climbs well and spends much of its time in trees as well as foraging on the ground. It hides in log piles, heaps of palm fronds, under fallen logs and in the crowns of palm trees. It feeds on both vegetable and animal matter, with oil palm fruits forming part of its diet.

Status

The Malayan field rat is an abundant and adaptable species with a very wide range, a large total population and an ability to live in a number of different environments. No particular threats have been identified, and in some areas it is regarded as a pest. The

has assessed its conservation status as being of "

References

* {{Taxonbar, from=Q139675 Rattus Rats of Asia Rodents of Indonesia Rodents of Malaysia Rodents of the Philippines Rodents of Thailand Mammals of Brunei Rodents of Borneo Mammals described in 1900 Taxonomy articles created by Polbot