[3] The long-tailed mouse ranges from sea level to approximately 1,200 m. and seems to prefer habitats that offer high rainfall, such as wet forests.

In a study of short-term responses of native rodents to various logging styles in old growth wet Eucalyptus forests, it was found that the long-tailed mouse was equally abundant across all forestry treatments and was positively correlated to reduced ground cover.

[citation needed] The long-tailed mouse is an opportunistic generalist omnivore whose diet is seasonal and varies with local availability.

Using fecal analysis, it was found to consume a wide range of plant matter, such as grasses, grains, bamboo, fruits, ferns, and mosses.

Tasmanian devils were also shown to have a negative effect on the long-tailed mouse and all other small mammal populations surveyed in this study.

[10] The long-tailed mouse breeds seasonally from September through June[11] Gestation generally lasts approximately 31–33 days, with an average litter of 3 young.