### Identification The Crest-tailed Mulgara is a robust, ginger-hued marsupial that looks like a cross between a tiny fox and a sturdy rat. It measures roughly 12–18 cm in body length, with a thick, carrot-shaped tail. To distinguish it from its near-identical cousin, the Brush-tailed Mulgara (*D. cristicauda*), look closely at the tail: *D. hillieri* features a distinct "fin" or crest of long black hairs along the upper surface of the tail’s tip, rather than a 360-degree "brush." Its underbelly is a clean, creamy white, and its ears are short and rounded, barely peeking above its dense, silky fur.
### Habitat & Range This desert specialist is found in the arid heart of Australia, primarily within the Lake Eyre Basin and the Simpson and Tirari Deserts. It is a creature of the dunes; you’ll find it inhabiting the crests and slopes of sand ridges, particularly where Nitre Bush (*Nitraria billardierei*) or Sandhill Cane Grass provide structural cover. It avoids the flat gibber plains, preferring the friable sands where it can engineer complex burrows.
### Behaviour Solitary and strictly nocturnal, the Mulgara is a master of energy conservation. By day, it retreats to deep, multi-tunnelled burrows that stay cool and humid. During winter, it utilizes daily torpor—lowering its body temperature for several hours to save energy. If you’re spotlighting at night, you might see its eyeshine—a faint, pale glow—as it dartingly moves between clumps of vegetation. It is a fierce defender of its territory, particularly during the winter breeding season.
### Diet Don't let the size fool you; this is a formidable carnivore. The Mulgara is a generalist predator, pouncing on anything it can overpower. Its diet includes large invertebrates like scorpions and spiders, but it regularly takes down small lizards and even other desert rodents. It kills with a precise, crushing bite to the head.
### Fascinating Fact The Crest-tailed Mulgara is a true desert alchemist—it never needs to drink liquid water. Its kidneys are so incredibly efficient that it extracts every drop of necessary hydration from the flesh of its prey, producing some of the most concentrated urine of any mammal known to science.