Male and female jumping spiders are the same species but very different animals. Understanding the differences prepares you for each life stage and helps you make the right choice when selecting your first spider.
📐 Size and Lifespan
Females are substantially larger than males across all jumping spider species kept in the hobby. A female P. regius reaches 18–22mm; a male typically 12–16mm. This size difference is sexual dimorphism — it exists because females invest enormous energy in egg production and brood care, requiring larger body mass.
Males also live significantly shorter lives. Female P. regius routinely reach 2–3 years; males rarely exceed 18 months and often die within 6–8 months of reaching adulthood.
🔬 Visual Differences
The most obvious difference in mature animals is the chelicerae — jaw-like appendages at the front of the head. Adult males develop highly iridescent chelicerae that reflect blue, green, or purple depending on species and lighting. Females have smaller, less iridescent chelicerae with more subdued colouration.
Juveniles can be difficult to sex reliably until 4th–5th instar. At that stage, the developing cheliceral colour begins to show in males. Females typically show richer abdominal patterning earlier. If unsure, wait — it becomes obvious by sub-adult stage.
🧠 Behavioural Differences
Adult males become noticeably more active and restless as they reach maturity — this is the onset of reproductive drive. They will pace the enclosure more, become less interested in food, and may spend more time at the enclosure walls. This is normal and expected, not a sign of a health problem.
If you’re keeping a male, plan your breeding attempt during his first month of adulthood. His reproductive fitness peaks early and declines rapidly. An adult male left unbred for 3+ months has significantly reduced breeding success.