Petaurillus hosei
Hose's pygmy flying squirrel

Petaurillus hosei (Hose’s Pygmy flying squirrel) is endemic to the eastern coast of Sarawak, on the northwestern side of Borneo. (Wilson and Reeder, 1993)

There was not any specific information found on the habitat of P. hosei but, as are most flying squirrels, Hose's pygmy flying squirrels are highly arboreal. These squirrels have only been found in lowland forest types and are reported to use tree cavities as nest holes. (Nowak, 1999)

Species in the genus Petaurillus are the smallest of the flying squirrels, with head and body length ranging from 68 to 89 mm and tail length from 62 to 98 mm. Hose's pygmy flying squirrels have large eyes and ears. The body is similar to that of all flying squirrels, with a flat hairy tail and a gliding membrane that extends between the fore and hindlimbs, called a patagium. Patagia increase the surface area of these squirrels, enabling gliding. A cartilaginous extension of the wrist bones assists in spreading the patagia. Flying squirrels have five digits on their hind limbs and four digits on their forelimbs, each digit has a long claw at the end, which assists in climbing trees. Hose's pygmy flying squirrels have dark dorsal fur and white ventral surfaces. They have a white spot behind each ear and pale or buffy colored cheeks. The tail is brown with a white tip. The teeth are not complex. (Eisenberg, 1989; MacDonald, 1984; Nowak, 1999; Redford and Eisenberg, 1992; Wilson and Reeder, 1993)

Information on the life span of P. hosei was not found but other, small flying squirrels may live to 5 to 6 years old in the wild. Because of their body size, Hose's pygmy flying squirrels may have relatively short lifespans. (MacDonald, 1984; Nowak, 1999)

Little is known about behavior in Hose's pygmy flying squirrels. Flying squirrels, in general, are nocturnal animals that mostly stay in the trees. They travel by scampering along branches and gliding between trees. Four individual Hose's pygmy flying squirrels were reported to be found in the same nest cavity, suggesting that there may be some sociality or that the individuals were a family group. These squirrels are nocturnal (Nowak, 1999)

Home Range

The home range is unknown.

Like other aspects of the natural history of Hose's pygmy flying squirrels, there is nothing known about social interactions. Other flying squirrels use sounds, chemical cues, and visual cues, such as movements with the tail, to communicate. These flying squirrels, like others, are likely to have excellent night vision and hearing that they use to navigate and avoid predation at night. They may have a keen sense of smell to locate food items and to communicate. (MacDonald, 1984)

No information was found on the diet of Hose’s pygmy flying squirrels. In general, flying squirrels eat seeds, fruits, and fungi. They may also take insects, bird eggs and nestlings, and other small animals as they find them. (MacDonald, 1984)

Predators of Hose's pygmy flying squirrels are unknown. Likely predators of these small, nocturnal, arboreal mammals are nocturnal raptors, such as owls and arboreal snakes. (MacDonald, 1984)

Because Hose's pygmy flying squirrels are likely to eat fruits, seeds, and fungi, they are likely to be important in dispersing tree seeds and fungal spores in their lowland, forest ecosystems.

There are no known adverse effects of P. hosei on humans.

Hose's pygmy flying squirrels, like other flying squirrels, are likely to impact seed and fungal spore dispersal in their native habitats through their feeding habits.

According to the IUCN’s red list of threatened species, P. hosei is listed as low risk, least concern. (Baillie, 2006)