### Identification The Red-headed Mouse Spider (*Missulena occatoria*) is a study in startling contrast. Males are unmistakable: they possess a brilliant, high-gloss scarlet cephalothorax (head) that pops against a deep, gunmetal-blue or black abdomen. Females, by contrast, are formidable, heavy-set tanks, reaching up to 24mm in length. They lack the male's red "hood," appearing uniform pitch-black or dark chocolate.
To tell them apart from the similar Funnel-web, look at the head: *Missulena* has a much wider, more bulbous "neck" and eyes spread across the front of the head rather than clustered on a central mound. Their chelicerae (fangs) are massive and glossy, capable of a dry bite that commands respect.
### Habitat & Range This species is a true Australian icon, found across the mainland in everything from semi-arid shrublands to open sclerophyll forests. While they are absent from the high-rainfall tropics and Tasmania, they thrive in well-drained soils where they can excavate deep, silk-lined retreats. Look for their burrows—often featuring two distinct trapdoors—hidden amongst leaf litter or in open patches of clay.
### Behaviour While most mygalomorphs (heavy-bodied spiders) are nocturnal, male Red-headed Mouse Spiders are famous for their bold daytime wanderings, especially after autumn rains. You’ll likely spot a male "high-stepping" across a trail in search of a mate. Females are the opposite: reclusive "stay-at-homes" that rarely leave their burrows. If cornered, both sexes display a classic "rearing" posture, lifting their front legs to reveal those formidable fangs.
### Diet These are patient ambush hunters. They sit just below the rim of their trapdoors, sensing the minute vibrations of passing prey. Their diet primarily consists of ground-dwelling insects like beetles and ants, but their powerful venom and sheer strength allow them to occasionally take down small lizards or frogs that wander too close to the burrow’s edge.
### Fascinating Fact While most heavy, ground-dwelling spiders are "earth-bound" for life, *Missulena occatoria* spiderlings are true aeronauts! Upon hatching, the tiny spiderlings climb to high points and "balloon," releasing silk threads to catch the wind and fly to new territories—a dispersal method usually reserved for much lighter, modern spiders.