[3] Nyctophilus major, referred to as a western long-eared bat, is a species found in forests and woodlands of Southwest Australia.

[5] The field worker John Gilbert carefully recorded local names in his notes, derived from the Nyungar language, and this was later reported in Gould's Mammals of Australia (1863).

The nose has a small leaf-shaped protuberance, simple in its details and lacking a Y-shape feature found in similar bats.

[10] Nyctophilus major possess the ability to enter a lengthy period of semi-hibernation in the austral winter, a state of torpor lasting up to sixty days.

[11] Nyctophilus major occurs in Western Australia, in the high rainfall southwest region of the Australian continent dominated by giant eucalypts and as an isolated population close to the Eyre Bird Observatory.

[13] The trees of the upperstory of its habitat are the large to very tall eucalypt species, karri Eucalyptus diversicolor, jarrah E. marginata, tuart E. gomphocephala, and marri Corymbia calophylla.

[13] Roost sites favoured by the N. major are tree hollows and amongst foliage, and beneath the loose thick bark of swamp paperbark (Melaleuca sp.)