The northern Luzon giant cloud rat (Phloeomys pallidus) or northern Luzon slender-tailed cloud rat, also known as bu-ot in Filipino, is a large species of rodent in the family Muridae. It is only found in Luzon, the Philippines.^[1][2][3]

Quick Facts Conservation status, Scientific classification ...

Northern Luzon giant cloud rat
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Family:	Muridae
Genus:	Phloeomys
Species:	P. pallidus
Binomial name
Phloeomys pallidus Nehring, 1890

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This very large rodent weighs 1.9–2.6 kg (4.2–5.7 lb) and is 75–77 cm (29.5–30.5 in) long, including its tail.^[3] The colour of its relatively long pelage, which also covers the tail, is highly variable, but usually it is mostly very pale brown-grey or white with some dark brown or black patches.^[3] They often have a black mask and collar, but can also be entirely white.^[2][3] The only other member of the genus Phloeomys, the southern Luzon giant cloud rat (P. cumingi), has a more southerly distribution, generally is smaller (although with some overlap) and it is entirely dark brown;^[4] however, the occasional brown Northern Luzon giant cloud rat has been reported in the Mountain Province,^[2] and the taxonomic limits between the two Phloeomys are not fully resolved.^[1]

The northern Luzon giant cloud rat is only found in northern and central part of Luzon, the Philippines.^[1] It is found in at least 12 provinces.^[2] The northern Luzon giant cloud rat prefers forest and scrub, but also occurs in degraded habitats such as plantations.^[1] It occurs from sea level to an altitude of about 2,200 metres (7,200 ft).^[3] In some areas it overlaps with the rarer giant bushy-tailed cloud rat, but that species mainly occurs at higher altitudes than the northern Luzon giant cloud rat.^[3]

The northern Luzon giant cloud rat is nocturnal and feeds on various types of vegetation.^[3] Because of its relatively large size, it does not enter traditional small-mammal traps and this has limited research in the species.^[5]

Northern Luzon giant cloud rats often live in pairs with one or two dependent young.^[2] They give birth in hollow boles of trees (standing or fallen) or in burrows in the ground.^[2] The sperm head of northern Luzon giant cloud rat has a short apical hook, with the sperm tail attached off-center basally.^[6] The tail of the sperm is about 127 μm long.^[6]

The northern Luzon giant cloud rat can cause extensive damage to rice crops and are sometimes considered a pest.^[7] They are regularly hunted for food in the Sierra Madre.^[8] It has been extirpated from some regions because of hunting,^[3] but overall it appears to be able to withstand hunting pressure and in general it remains common and widespread.^[1]

• Cloud rat